Failure to mix a specimen containing an anticoagulant by inverting the sealed specimen container several times after collection of the specimen is due to the clots in specimen.
Clots in specimen or clotted specimen refers to an abruptly clotted blood specimen in which clotting occurs in that tube which contains anticoagulant. A specimen is clotted when the anticoagulant in the tube is not adequately mixed.
To mix and ensure adequate anticoagulation of the specimen, tube filled with the blood has to be inverted 8 - 10 times immediately, so that clots in specimen do not occur.
Specimen is supposed to be mixed immediately to ensure that anticoagulant in the tube has been fully dissolved with the specimen, which in return maintains the effective anticoagulant-to-specimen ratio and provides a specimen free from any clots.
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james chadwick discovered this particle, which was the last of the subatomic particles to be characterized.
James Chadwick discovered the neutron, which was the last of the subatomic particles to be characterized.
James Chadwick bombarded alpha particles on the beryllium surface using radioactive decay o polonium as a source. He discovered penetrating particles with no charge. These particles were fast-moving with no positive or negative charge.
These radiations were made incident on paraffin wax. This experiment was very similar to Rutherford's experiment.
The mass of the neutron was almost equal to the mass of the proton but its penetrating power was higher than a proton. It can penetrate several inches of lead.
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How many different 250-amino-acid-long polypeptides, each with a unique sequence, can be formed?
a) 20250
b) 4250
c) none of these
d) 25020
e) 2504
20^250 unique sequence can be formed with different 250 amino acid long polypeptides.
The building blocks of proteins are termed polypeptides, which are molecular chains made up of around 20 amino acids.The method of determining how amino acids are arranged in proteins and peptides is known as amino acid sequencing. Although many diverse amino acids have been found in nature, the human body only need twenty different types of amino acids to make all of its proteins.An amine-terminus, also known as the N-terminus, is an amino acid residue with an amine group attached to the alpha-carbon. This is where the primary protein structure typically starts. The C-terminus of the main structure, which has an unbound carboxyl group, is located at the opposite end. Each of the naturally occurring amino acids is identified by a one- or three-letter code.Therefore, the correct option is a) 20^250
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The+percent+by+mass+of+sodium+chloride+in+a+solution+of+14.0+g+of+sodium+chloride+in+enough+water+to+make+91.0+g+of+solution+is:_________
a. 15.4%
b. 84.6%
c. 13.3%
d. 86.7%
e. 115%
The correct answer is [a].The percent by mass of sodium chloride in a solution of 14.0 g of sodium chloride in enough water to make 91.0 g of solution is 15.4%.
What is a solution?Solution, in chemistry, homogenous mixture of two or more substances in relative amounts that can be varied continuously up to what is called the limit of solubility.
The term solution is commonly applied to liquid state of matter, but solutions of gases and solids are possible. Air, for example, is a solution consisting chiefly of oxygen and nitrogen with the trace amounts of several other gases, and brass is a solution composed of copper and zinc.
Solutions play a significant role in the processes of life. In blood plasma, oxygen from the lungs dissolves and chemically joins with hemoglobin in red blood cells before being delivered to the body's tissues. The byproducts of digestion are also transported to other bodily areas in solution. Many real-world situations can be solved by using liquids' capacity to dissolve other liquids or solids.
Chemists take advantage of differences in the solubility to separate and purify materials and to carry out chemical analysis. Most chemical reactions occur in solution and are influenced by solubilities of the reagents. Materials for chemical manufacturing equipment are selected to resist solvent action of their contents.
Percent by mass= [tex]\frac{weight of solute}{weight of solution}[/tex]*100= [tex]\frac{14}{91}*100= 15.4%[/tex][tex]%[/tex]%
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A desk measures 42 inches long. How many centimeters is that
Answer: 106.68 cm
Explanation:
1 inch=2.54 cm
42 inches * 2.54 cm/1 in=
42 * 2.54 = 106.68 cm
how many km are equal to 15500m
[tex] \bf \implies \: 15.5 \: km[/tex]
Step-by-step explanation:We know that,
1 m = 1000 km
1 km = 1/1000 m
According to questionWe have converted 15500 m to km
[tex] \mapsto \bf \frac{155 \cancel{0} \cancel{0}}{10 \cancel{0} \cancel{0}} = \frac{155}{10} = 15.5 \: km[/tex]
The energy flow to the earth from sunlight is about 1.4 kw>m2 . (a) find the maximum values of the electric and magnetic fields for a si- nusoidal wav
The maximum values of the electric and magnetic fields is 3.42*[tex]10^{-6}[/tex] T.
What is the electric and magnetic field?Electric fields arise from the electric charges and changing magnetic fields.
An electric charge, or collection of the charges, will have an associated electric field. Any charged object placed in this field will experience an electrostatic force as field interacts with the charge of the object. Field lines represent force a positively charged particle would experience if it were in the field at that point.
A changing magnetic field can also cause the electric charges to move. This phenomenon is commonly used in the electric generators to induce electric currents in wires. The induced current can be increased by causing the larger changes in the magnetic field or by coiling the wire so that more wire is affected by the changing magnetic field.
Magnetic fields arise from the permanent magnets and electric charges in motion.
Magnets can occur naturally (such as the Earth’s magnetic field), or they can be made by magnetizing the ferromagnetic materials.
Intensity I = 1.4*[tex]10^{3}[/tex] w/[tex]m^{2}[/tex]
Total Energy density [tex]U_{avg}[/tex] = [tex]\frac{1}{2} E_{o}E_{o} ^{2}[/tex]
a) energy density = I/C
Therefore, 1/2 [tex]E_{o}E_{o}^{2}[/tex] = I/C
1/2 * 8.85 * [tex]10^{-12}[/tex] * [tex]E_{o}^{2}[/tex] = 1400/(3*[tex]10^{8}[/tex])
[tex]E_{o} ^{2}[/tex] = 105.46*[tex]10^{4}[/tex]
[tex]E_{o}[/tex] = 10.27*[tex]10^{2}[/tex] N/C
[tex]B_{o}[/tex] = [tex]\frac{E_{o} }{C}[/tex] = (10.27*[tex]10^{2}[/tex])/ (3*[tex]10^{8}[/tex]) = 3.42*[tex]10^{-6}[/tex] T
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Who is Bobby Matthews
Answer:
Born: 21 November, 1851, Baltimore, Maryland, United States
Died: 17 April , 1898, Baltimore, Maryland, United States
He is an American baseball player, known as being one of the inventors of the spitball pitch, which was rediscovered or reintroduced to the major leagues after he died. He earned run average: 2.86
Explanation:
I hope this helps
Enough of a monoprotic acid is dissolved in water to produce a 0.0158 m solution. the ph of the resulting solution is 2.64. calculate the a for the acid.
PH = 2.64
PH = - log [H+]
[H+] = 0.00229 M
HA = 0.0199 M
Dissociation equation
HA --> H+ + A-
Ka = [H+][A-]/[HA]
[H+] = [A-]
Ka = (0.00229^2)/0.0158
=3.31 x 10^-4M
What is monoprotic acids?
Any acid with only one hydrogen atom in its formula is called a monoprotic acid, while some acids with multiple hydrogen atoms may also fall under this category. In other words, while all monoprotic acids contain only one hydrogen, not all single-hydrogen acids are monoprotic.
Therefore,
Enough of a monoprotic acid is dissolved in water to produce a 0.0158 m solution. the ph of the resulting solution is 2.64. calculate the a for the acid.
pH = 2.64
pH = - log [H+]
[H+] = 0.00229 M
HA = 0.0199 M
Dissociation equation
HA --> H+ + A-
Ka = [H+][A-]/[HA]
[H+] = [A-]
Ka = (0.00229^2)/0.0158
=3.31 x 10^-4M
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Please help i dont understand how to do this, and if you answer please show your work for it
Calculate the mass of (the ^ means exponent)
7.06 x 10^23 He atoms
1.07 x 10^23 Mg atoms
4.06 x 10^22 molecules of O2
8.19 x 10^24 molecules CO
Calculate the volume of
2800 g of C6H1206
45 moles of H2O
9.2 grams of Fe
2.8 x 10^26 particles of Al2O3
5.6 moles of H2SO3
The Avogadro's number is used to obtain the required results as;
1) 4.69 g
2) 4.26 g
3) 2.158 g
4) 381 g
5) 348.5 L
6) 1008 L
7) 3.6 L
8) 4.7 * 10^4 g
9) 112 L
What is the Avogadro’s number?The Avogadro’s number could be used to deduce the amount of substance. Let us recall that in the theory of Professor Avogadro, the mole is the number of elementary entities of a substance. In this case these elementary entities is a reference to the atoms, molecules and ions that could be found in the substance. With that in mind, we shall now carry out the calculations.
1) 6.02 * 10^23 atoms of helium has a mass of 4g
7.06 x 10^23 He atoms of He has a mass of 4.69 g
2) 6.02 * 10^23 atoms of Mg has a mass of 24 g
1.07 x 10^23 Mg atoms has a mass of 4.26 g
3) 6.02 * 10^23 molecules of O2 has a mass of 32 g/mol
4.06 x 10^22 molecules of O2 has a mass of 2.158 g
4) 6.02 * 10^23 molecules of CO has a mass of 28 g
8.19 x 10^24 molecules CO has a mass of 381 g
5) Number of moles = 2800g/180 g/mol = 15.56 moles
Given that 1 mole occupies 22.4 L
15.56 moles occupies 348.5 L
6) Given that 1 mole occupies 22.4 L
45 moles occupies 1008 L
7) Number of moles of Fe = 9.2 g/56 = 0.16 moles
Given that 1 mole occupies 22.4 L
0.16 moles occupies 3.6 L
8) 6.02 * 10^23 particles have a mass of 102 g
2.8 x 10^26 particles have a mass of 4.7 * 10^4 g
9) Given that 1 mole occupies 22.4 L
5 moles of the acid occupies 112 L
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Carbon-14 has a half life of 5600 years. if you had a sample of 100arbon-14, how much would still be carbon-14 after 33,600 years?
Since half-life of carbon-14 is 5600 years, 1.5625mg of the element will be remaining after 33600 years.
The duration needed for a quantity of a substance to decrease to half of its initial value is known as the half-life. In nuclear physics, the phrase is frequently used to indicate how rapidly unstable atoms disintegrate radioactively or how prolonged stable atoms last. The duration it takes for half of an element in a radioisotope to decay is known as the half-life. The faster an atom decays and the shorter its half-life, the more unstable it is. Additionally, the phrase can be used more broadly to describe any kind of exponential decay.
Given:
Initial quantity of substance, [tex]N_0[/tex] = 100mg
Half-life of the substance, [tex]t_{1/2}[/tex] = 5600 years
Time elapsed, t = 33600 years
To find:
Quantity of substance remaining, [tex]N_t[/tex] = ?
Formula:
[tex]N_t = N_0 * (\frac{1}{2}) ^ (\frac{t}{t_\frac{1}{2} } )[/tex]
Calculations:
[tex]N_t = 100 * (\frac{1}{2}) ^ \frac{33600}{5600}[/tex]
[tex]N_t = 100 * (\frac{1}{2}) ^6[/tex]
[tex]N_t[/tex] = 100 x 0.015625
[tex]N_t[/tex] = 1.5625mg
Result:
Remaining carbon-14 after 33600 years is 1.5625mg.
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We may never know how many people became ill or died as a result of the chernobyl accident. what is the main reason why this is so difficult to determine?
We may never know the number of people became ill or died as a result of the Chernobyl accident because cancer might not occur for many years after the exposure to the ionizing radiation.
Many of the first responders of the Chernobyl accident died within hours or days of working at the explosion site because of acute radiation sickness.
The Chernobyl accident occur in 1986 due to flawed reactor design operated by untrained personnel.
The Chernobyl did cause serious radiation sickness and contamination over a large population. Although it is difficult to determine the extent to which the negative effects of Chernobyl reached.
Radiation exposure is hazardous and impacts health of people in negative ways, causing cancer and other serious and life threatening illness. Chernobyl caused the same effects as explosions caused radioactive particles to scatter and these moved through the ecosystem through bioaccumulation.
The Chernobyl accident showed us that exposure to radiation can affect people to varying extents over different time scales.
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classify each element. note that another term for main group is representative, another term for semimetal is metalloid, and the inner transition metals are also called the lanthanide and actinide series. you are currently in a sorting module. turn off browse mode or quick nav, tab to items, space or enter to pick up, tab to move, space or enter to drop. main‑group metal (representative metal) main‑group nonmetal (representative nonmetal) main‑group semimetal (metalloid) transition metal inner transition metal (lanthanide/actinide)
Am, In, Ta, As, Se, Rn, Hf, Am
Tantalum and hafnium are transition metals.
An inner transition element is americium.
Main group elements include radon, selenium, and indium.
Metalloids include arsenic.
What is transition metals?
The concise IUPAC definition is expanded by Cotton and Wilkinson by detailing which elements are included. They add scandium and yttrium from group 3, which have a partially full d sub-shell in the metallic state, along with the elements of groups 4 to 11.
They classify lanthanum and actinium as group 3 elements, while they are actually categorized as lanthanides and actinides, respectively.
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Stanley miller applied heat and electrical sparks to a mixture of simple inorganic compounds -- methane, hydrogen gas, ammonia, and water vapor. what compound(s) were produced in this experiment?
In this experiment, simple organic compounds as well as more sophisticated organic compounds including amino acids and hydrocarbons were created.
What is Stanley miller's experiment?
Stanley Miller, a scientist, carried out an experiment in 1953 that might shed light on what happened on the early Earth billions of years ago. In a flask containing a mixture of methane, ammonia, hydrogen, and water, he passed an electrical charge across it. Organic substances, such as amino acids, were produced as a result.
Based on the idea that life might have started from simple chemicals found on the early Earth, Miller conducted the renowned experiment in 1953.
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what is an exothermic reaction? which has greater energy in an exothermic reaction, the reactants or the products?
The reactants has greater energy in an exothermic reaction. Exothermic reactions often produce heat as defined by thermochemistry.
What is an exothermic reaction?Exothermic reactions often produce heat as defined by thermochemistry as "reactions for which the total standard enthalpy change H is negative."
According to the energy diagram below, in an exothermic reaction, the reactants have a greater energy level than the products. The products are therefore more stable than the reactants. Overall, the reaction's H H H is negative, meaning that energy is expelled as heat.
When new bonds form in the products, less energy is produced during an exothermic reaction than is required to break bonds in the reactants. Energy is continuously released during an exothermic process, frequently in the form of heat. Exothermic reactions characterise all combustion processes.
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when one molecule of sucrose is burned with oxygen to make carbon dioxide and water, how many carbon dioxides are made? hint, carbon dioxide is co2.
One molecule of sucrose is burned with oxygen to make carbon dioxide and water.
What is sucrose?
The components of the disaccharide sugar sucrose are glucose and fructose. It is produced naturally by plants and is the main component of white sugar. C12H22O11 is the chemical formula for it.
To extract and refine sucrose for human use, either sugarcane or sugar beet are employed. Crushing the cane creates raw sugar, which is subsequently delivered to other sectors to be refined into pure sucrose. Sugar mills are usually located in tropical regions near to sugarcane plantations.
C12H22O11 + 12O2 = 12CO2 + 11H2O
When one molecule of sucrose is burnt, we get 12 carbon dioxide molecules.
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How many moles of hydrogen are present in a 43.50 ml sample at 25.5 degrees celsius and 772.8 torr?
moles of hydrogen present in a 43.50 ml sample at 25.5 degrees celsius and 772.8 torr are 0.0017
Mole is the name of a common scientific unit used to measure huge amounts of very small objects, such as atoms, molecules, or other specific particles.The principles governing ideal gases are known as ideal gas laws and were developed as a result of Boyle's observational research.The equation of state for a hypothetical ideal gas is known as the ideal gas law. Although it has several drawbacks, it is a good approximation of the behaviour of numerous gases under various circumstances.PV = nRTThe combination of a gas, pressure and volume has a constant relationship with the sum of its moles, temperature, and the universal gas constant.
This problem can be solved by ideal gas law
PV=nRT
P = pressure, 772.8torr × (1atm/ 760 torr)= 1.01 atm
V = volume, 43.50mL (1L/1000mL)= 0.0435L
T = temperature, 25 deg celcius or 273 +25.5= 298.5K
R = 0.0821 (L*atm/K*mol) (constant)
We have to find out n
n= PV/RT
n= (1.01atm)(0.0435L) / (0.0821 L*atm/K*mol) (298.5K)
n= 0.0439 / 24.5
n = 0.0017
Therefore, no of moles of hydrogen are 0.0017.
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Which phenomenon is most likely due to the high specific heat capacity of water?
Due to the large specific heat capacity of water, Santa Monica Bay, off the coast of Los Angeles, experiences less seasonal temperature variation than the surrounding air.
What is specific heat capacity?
The amount of heat required to increase a substance's temperature by one degree Celsius (°C) in one gram is known as specific heat. Water has a high specific heat, which means that heating it up requires more energy than heating up other substances.
Specific heat capacity (symbol: c) in SI units is the quantity of heat in joules needed to elevate 1 gram of a substance by 1 Kelvin. J/kgK is another way to put it. It is also possible to express a specific heat capacity in terms of calories per gram of temperature in Celsius.
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three pure compounds are formed when 1.00-g samples of element x combine with, respectively, 0.472 g, 0.420 g , and 0.236 g of element z. the first compound has the formula x2z3.
The answers would be for 2nd and 3rd composites are X3Z4 and X4Z3.
The given questions is incorrect, the question is that the first emulsion has the formula X2Z3. also what is the chemical formula for alternate and also the third emulsion?
According to the question,
Mass of X in first emulsion = 1.0 g
Mass of Z in first emulsion = 0.472 g
The chemical formula of first emulsion = X2Z3
This means1.0 g of X is over to 2 intelligencers of X
= > One operative of X = 0.5 g of X.
g of Z is similar to 3 intelligencers of Z< = > one operative of Z = 0.15733 g of X.
Now for the Alternate emulsion,
Mass of X = 1.0 g
intelligencers of X = 1.0/0.5 = 2
Mass of Z = 0.420 grams
Number of intelligencers of Z = 0.420/0.15733 = 2.6695 intelligencers
rate of intelligencers of X to Z = 22.6695 = 3 4
Empirical formula of alternate emulsion = X3Z4
Now for the third emulsion,
Mass of X = 1.0 g
Intelligencers of X = 1/0.5 = 2 intelligencers
Mass of Z = 0.236 grams
Number of intelligencers of Z = 0.236/0.15733 = 1.5 intelligencers
Rate of intelligencers of X to Z = 21.5 = 4 3
Empirical formula of third emulsion = X4Z3
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What is true about these atoms and molecules?
O All of these are molecules
O B and Care atoms; A, D and E are molecules
O A, D and E are atoms; B and C are molecules
O A and D are atoms; B, C and are molecules.
Answer:
Tbh it doesn't look right because A D are atoms B E C are molecules.
Explanation:
The reason I think that is because E is the molecule of elements while B and C are molecules of compounds can you maybe recheck?
100.0 ml of a 0.530 m solution of kbr is diluted to 500.0 ml. what is the new concentration of the solution?
The new concentration of the solution of KBr diluted to 500 mL is 0.106 M
To solve this problem, the formula and the procedure that we have to use is:
c1 * v1 = c2 * v2
Where:
c1= concentration of the concentrated solution (M)v1 = volume of the concentrated solution(mL)c2 = concentration of the diluted solution(M)v2 = volume of the diluted solution(mL)Information about the problem:
c1 = 0.530 Mv1= 100.0 mLv2= 500.0 mLc2 = ?Applying the dissolution of concentrations formula and clearing the concentration of the diluted solution(c2), we get:
c1 * v1 = c2 * v2
0.530 M * 100.0 mL = c2 * 500.0 mL
c2 = (0.530 M * 100.0 mL ) / 500.0 mL
c2 = 0.106 M
What is a solution?In chemistry a solution is known as a homogeneous mixture of two or more components called:
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Choose the best description for prokaryotic cell.
has a nucleus; found in multicellular organisms
has no nucleus; found in unicellular organisms
has no nucleus; found in multicellular organisms
has a nucleus; found in unicellular organisms
Answer:
has no nucleus; found in unicellular organisms
Explanation:
Hope It Helps
Sorry If I'm Wrong
Answer: Has no nucleus found in unicellular organisms
Explanation:
Prokaryotic cells are primitive cells found in lower organisms. Prokaryotic cells do not have a true cell.
A true nucleus lacks an envelope which contains the nuclear materials.
Most of the organelles lacks membrane bound organelles.
The true nucleus is lacking in prokaryotes.
Eukaryotic cells have true nucleus.
a piece of sulfur weighs 227 g. when it was submerged in a graduated cylinder containing 50 ml of water, the level rose to 150 ml. what is the density (g/ml) of the sulfur?
The density is = 2.27 g/ml.
A certain object's mass in relation to its volume is measured by its density. High density is a term used to describe materials that are exceedingly compact and have a high mass.
What is density ?A substance's density is defined as its mass per unit of volume. Density is most frequently represented by the symbol, however Latin letter D may also be used. Mass divided by volume is the definition of density in mathematics:
row = m/V
where is the density, m is the mass, and V is the volume.
Given in the question:
Mass of piece of sulfur= 227g
The volume of water that has been disoplaced= (150-50)mL =100mL
We can find the density by:
Density = Mass/Volume
Density = 227/100
Density = 2.27 g/ml
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what is the arrow pointing to? a solution of different molecules. some of them consist of two small atoms attached to a bigger one. some are negatively charged, and consist of one big atom attached to a small one. there are also small positively charged atoms, which are pointed at by an arrow. what is the arrow pointing to? a solution of different molecules. some of them consist of two small atoms attached to a bigger one. some are negatively charged, and consist of one big atom attached to a small one. there are also small positively charged atoms, which are pointed at by an arrow. electron hydroxide ion hydronium ion water molecule hydrogen ion
Some of them consist of two small atoms attached to a bigger one. Some are negatively charged, and consist of one big atom attached to the small one. The arrow is pointing to a hydrogen ion.
Option A is correct
What is a hydrogen ion? All hydrogen ions and their isotopes must be referred to as hydrogen ions, according to IUPAC,A hydrogen atom loses or gains an electron, leading to the formation of a hydrogen ion. Only when it is in a gaseous state or a condition that is almost particle-free can a positively charged hydrogen ion (or proton) be observed separately because it can easily combine with other particles.A hydrogen atom is made up of a single electron and a nucleus with a charge of 1. That indicates the only positively charged ion which is possible to have charge +1. it is represented as H+.
The hydrogen ion is the only particle that is an atom and also carry a positive charge, i.e., a hydrogen ion is a positively charged atom.
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Question is in complete , missing part is given below :
The figure shows a solution of different molecules. Some of them consist of two small atoms attached to a bigger one. Some are negatively charged, and consist of one big atom attached to the small one. There are also small positively charged atoms, which are pointed by an arrow.
A. hydrogen ion
B. hydronium ion
C. electron
D. hydroxide ion
E. water molecule
What is the mass of 1.00 mole of an unknown compound with the formula xy if the molecular weight of x is 35.67 g and the molecular weight of y is 40.59 g?
The mass of one mole of this unknown compound 'XY' is 76.26gm.
Given here, the 1 mol of unknown compund 'XY' and mass of X and Y are 35.67gm and 40.59 gm respectively.
Molar mass of XY = molar mass of X + molar mass of Y=35.67gm + 40.59 gm = 76.26gm.
We can find given mass of 'XY' compound by formula,
Mole = Given mass/Molar mass
1= Given mass /molar mass
Given mass = molar mass.
Given mass = 76.26gm.
So, the given mass of XY is equals to 76.26gm.
Mole is defined as the unit of amount of substance. The quantity of amount of substance is measured in mole as 1mol contain exactly 6.023×1023 particles or entities. Mole is calculated by the ratio of the given mass and the molecular mass of the compound.
The relation of mole and molarity is given by the formula, Molarity is equals to no. of moles of solute divided by the solution in litres. S.I unit of molarity is moles per litre.
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ca(oh)2(aq) + 2hcl(aq)-->2 h2o(l) + cacl2(s) determine the limiting reactant when 1.00 g of each reactant is combined. what is the theoretical yield of h2o?
The balanced chemical reaction is: ca(oh)2(aq) + 2hcl(aq)-->2 h2o(l).
What is redox reaction?Redox is a sort of chemical reaction where the substrate's oxidation states change.
An rise in an object's oxidation state or the loss of electrons is referred to as oxidation.
Gaining electrons or lowering an atom's oxidation state are both considered to be reductions in the context of chemical reactions.
Redox reactions can be divided into two categories:
only one electron (typically) moves from the reducing agent to the oxidant during an electron transfer. Redox couples and electrode potentials are frequently used to describe this type of redox reaction.
Atomic transfer refers to the movement of an atom from one substrate to another. For instance, when iron rusts, iron atoms get more oxidized as they change into an oxide at the same time.
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An acid can react with a metal hydroxide to form a salt and water. Name the salt formed when sodium hydroxide reacts with ethanoic acid.
Answer: sodium ethanoate
Explanation: I believe that this is correct
101.0 has how many significant figures?
Answer: three significant figures
Explanation: All zeroes between two nonzero digits are significant, for example, 101 contains three significant figures.
Solve for b.
a(b+1)=-c
What nuclide is formed when th-230 undergoes alpha emission?
a) au-226
b) pb-226
c) ra-230
d) ra-226
e) pa-230
The nuclide thorium-230 undergoes alpha emission to give radium-226
Thorium-230 undergoes alpha decay, a form of nuclear decay in which an alpha particle is ejected from the nucleus, and as a result, produces alpha radiation. Because of the imbalance in the energy working to hold the nucleus together or drive the nucleus apart caused by unstable isotopes' neutron to proton ratio, these isotopes are unstable.
This thorium then changes into protactinium 234 and experiences beta-negative decay to yield uranium 234 as a byproduct. With a half-life of 245,000 years, this final isotope progressively decays into thorium 230, another unstable nucleus. Only the creation of a stable nucleus can end any such decay chain.
The nuclide whose radioactive decay product is a certain daughter nuclide is referred to as the parent nuclide (plural parent nuclides) in physics.
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calculate the number of pounds of co2 released into the atmosphere when a 25.0 gallon tank of gasoline is burned in an automobile engine. assume that gasoline is primarily octane, c8h18, and that the density of gasoline is 0.692 g⋅ml−1. this assumption ignores additives. also, assume complete combustion. co2 released: lb
445.616 lb of CO2.
Equation for the reaction:
C8H18 + 25/2O2(g) --> 8CO2(g) + 9H2O(g)
Given:
The volume of gasoline = 25gallon
Converting gallon to ml,
25 gallon * 3.785 l/1 gallon * 1000 ml/1 l
= 94,625 ml
Density of the gasoline = 0.692 g/ml
Mass = density * volume
= 94,625 * 0.692
= 65480g
Molar mass of octane = (8*12) + (18*1)
= 114 g/mol.
Number of moles = mass/molar mass
= 65480/114
= 574.390 mol.
From the above equation, 1 mole of octane was completely burnt to give off 8 moles of CO2.
By stoichiometry,
Number of moles of CO2 = 574.390* 8
= 4595.122 mol of CO2.
Molar mass of CO2 = 12 + (2*16)
= 44 g/mol
Mass of CO2 = number of moles * molar mass
= 4595.122 * 44
=202,185.40 g
Converting g to pound,
= 202,185.40 g *1 kg/1000 g * 2.204 lb/1kg
= 445.616 lb of CO2.
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