The percent yield of H₂O, if 87.0 g of H₂O is produced by combining 95.0 g of O₂ and 11.0 g of H₂ is 87.87%.
How do we calculate mass from moles?Mass of any substance will be calculated by using their moles as:
n = W/M, where
W = given or required mass
M = molar mass
Moles of 95g of Oxygen (O₂) = 95g / 32g/mol = 2.96 moles
Moles of 11g of hydrogen (H₂) = 11g / 2g/mol = 5.5 moles
Given chemical reaction is:
2H₂ + O₂ → 2H₂O
From the stoichiometry of the reaction, it is clear that:
1 moles of O₂ = reacts with 2 moles of H₂
2.96 moles of O₂ = reacts with 2×2.96=5.92 moles of H₂
Here hydrogen is the limiting reagent as it has lower moles and formation of water depends on this only.
2 moles of H₂ = produces 2 moles of water
5.5 moles of H₂ = produces 5.5 moles of water
Mass of 5.5 moles of water will be calculated as:
W = (5.5mol)(18g/mol) = 99g
Given theoretical yield of water = 87g
% yield of water will be calculated as:
% yield = (87 / 99)×100 = 87.87%
Hence required value is 87.87%.
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Answer:
D
Explanation:
zinc sulfide with oxygen has (O2) to yield zinc oxide and sulfur oxide.
(i need the formula)
Answer:
The reaction between zinc sulphide and oxygen gives zinc oxide and sulfur dioxide. The chemical equation of the reaction is: 2ZnS + 3O2 → 2ZnO + 2SO2 2 moles of ZnS react with 3 moles of O2 to form 2 moles of ZnO and 2 moles of SO2
Explanation:
Explain the role of gravity in the waterfall.
Explanation:
A water fall falls and hits the base with force depending on the distance from which it fell.This force is caused by gravity pulling the water molecule as well as some other particles like eroded soil rapidly downwards.
How many liters of carbon gas are in 13.7 moles of carbon dioxide gas at STP?
At STP
1 mol weighs 22.4LNo of moles=13.7mol
Total volume:-
13.7(22.4)306.88L[/tex]The volume of gas occupied by 13.7 moles at STP is 306.88L.
What is STP?
STP stands for standard temperature and pressure. STP refers to a specific pressure and temperature used to report on the properties of matter.
According to IUPAC( International Union of Pure and Applied Chemistry), it is defined as -
Temperature of 0 degree celsius (273K)Pressure of 1 atmIt is generally needed to test and compare physical and chemical processes where temperature and pressure plays an important role as they keep on varying from one place to another.
One mole of a gas under STP conditions occupies a volume of 22.4L.
Given,
Moles of carbon dioxide gas = 13.7 moles
We know that,
1 mole of a gas occupies 22.4 L of volume at STP.
Thus, 13.7 moles will occupy 13.7 × 22.4 L
= 306.88 L
Therefore, the volume of gas occupied at STP is 306.88L.
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A neutralization reaction between HCl and NaOH has taken place in the lab, below is the data. Please determine the concentration of the unknown HCl solution. Please make sure all final answers are written using the correct number of significant figures and using scientific notation.
1 HCl + 1 NaOH 1 H2O + 1 NaCl
Molarity of NaOH = 1.00 M
What is the change in volume of NaOH?
From the table showing the data involving the neutralization reaction between HCl and NaOH, the concentration of the HCl solution would be 0.864 M
Titration calculationFrom the available data:
Volume of acid used = 0.0351 - 0.0131 = 0.022 L
Volume of base used = 0.0575 - 0.0385 = 0.019 L
Concentration of base = 1.00 M
Number of moles of acid and base = 1
Using the equation: CaVa/CbVb = Na/Nb = 1
Ca = 1x0.019/0.022 = 0.864 M
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What does the energy hill represent on an energy diagram?
A. The potential energy gained by the products when a reaction
happens
B. The potential energy the reactants have stored in molecular bonds
O C. The additional potential energy the reactants must gain in order to
react
D. The final amount of potential energy of the products of the
reaction
B.The potential energy the reactants have stored in molecular bonds
Which substance is known as the universal solvent because it dissolves more solutes than any other solvent?.
Answer:
Water(H20)
Explanation:
Water is called the universal solvent because more substances dissolve in water than in any other chemical. This has to do with the polarity of each water molecule. The hydrogen side of each water (H2O) molecule carries a slight positive electric charge, while the oxygen side carries a slight negative electric charge.
Complete and balance the following half-reaction in acidic solution mno4 ---> mno2
The completely balanced reaction of the half-reaction in acidic solution is ; MnO₄⁻ (aq) + 3e⁻ + 4H⁺ ------> MnO₂(s) + 2H₂O(l)
Given data :
The half-reaction in acidic solution
MnO₄⁻ (aq) --> MnO₂(s)
Complete and balance the Half-reactionDetermine the oxidation number on both sides
Oxidation number of Mn in MnO₄⁻ = +7
Oxidation number of Mn in MnO₂ = +4
First step : Balance the oxidation number
MnO₄⁻ (aq) + 3e⁻ ------ > MnO₂(s)
Next step : Balance the charge in the reaction
MnO₄⁻ (aq) + 3e⁻ + 4H⁺ ------> MnO₂(s)
Final step : Completely balance the half reaction
MnO₄⁻ (aq) + 3e⁻ + 4H⁺ ------> MnO₂(s) + 2H₂O(l)
Hence we can conclude that The completely balanced reaction is :
MnO₄⁻ (aq) + 3e⁻ + 4H⁺ ------> MnO₂(s) + 2H₂O(l)
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NEED HELP ASAP PLEASE !!!
Explanation:
H2S is the limiting reagent
H2S= 1/8 (least value)
O2= 1/4
Based on the results of testing colorless solutions with indicators, which solution is most acidic?
A solution in which methyl orange is red indicates the most acidic substance.
What is an Indicator?This is defined as a substance that gives a visible sign, usually by a colour change when a chemical species is added.
On litmus paper, the redder the color is, the more acidic it is which was why methyl orange changing to darker red signifies most acidity.
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Given the following equation: Cu + 2 AgNO3 ---> Cu(NO3)2 + 2
Ag How many grams of Cu are needed to react with 262g moles of
AgNO3?
Given the following equation; Cu + 2AgNO3 = Cu(NO3)2 + 2Ag, 48.97 grams of Cu are needed to react with 262g of AgNO3.
How to calculate mass of substances?The mass of a substance can be calculated using the following steps:
Cu + 2AgNO3 = Cu(NO3)2 + 2Ag
1 mole of Cu react with 2 moles of AgNO3
Molar mass of AgNO3 = 169.87 g/molMolar mass of Cu = 63.5g/molmoles of AgNO3 = 262g/169.87g/mol = 1.54mol
1.54 moles of AgNO3 will react with 0.77 moles of Cu.
mass of Cu = 0.77 × 63.5 = 48.97g
Therefore, given the following equation; Cu + 2AgNO3 = Cu(NO3)2 + 2Ag, 48.97 grams of Cu are needed to react with 262g of AgNO3.
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A compound has a molecular weight of 112. 124 atomic mass units and the empirical formula C3H4O. What is the molecular formula of the compound? Use the periodic table to help you. A. C6H8O B. C9H12O3 C. C8H4O2 D. C4H8O2 E. C6H8O2.
The molecular formula of the compound which has a molecular weight of 112.124 atomic mass units is C₆H₈O₂.
What is molecular formula?Molecular formula of any compound tells about the composition and numbers of each entities present in that molecule.
Steps involved in the prediction of molecular formula:
First we predict the molar mass of given emperical formula as:Molar mass of C₃H₄O = 3(12) + 4(1) + 16 = 56
Now we divide the given mass by the calculated mass of empirical formula:112.124/56 = 2
Now we multiply the subscripts of given empirical formula by this whole number and we get:Molecular formula = (C₃H₄O)₂ = C₆H₈O₂
Hence correct option is (E).
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60 points please help me i will appreciate it!
Answer:
This is a pretty straightforward example of how an ideal gas law problem looks like.
Your strategy here will be to use the ideal gas law to find the pressure of the gas, but not before making sure that the units given to you match those used by the universal gas constant.
So, the ideal gas law equation looks like this
∣
∣
∣
∣
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
a
a
P
V
=
n
R
T
a
a
∣
∣
−−−−−−−−−−−−−−−
Here you have
P
- the pressure of the gas
V
- the volume it occupies
n
- the number of moles of gas
R
- the universal gas constant, usually given as
0.0821
atm
⋅
L
mol
⋅
K
T
- the absolute temperature of the gas
Take a look at the units given to you for the volume and temperature of the gas and compare them with the ones used in the expression of
R
.
a
a
a
a
a
a
a
a
a
a
a
Need
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
Have
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
Liters, L
a
a
a
a
a
a
a
a
a
a
a
a
a
Liters, L
a
a
a
a
a
a
a
a
a
a
a
√
a
a
a
a
a
a
a
Kelvin, K
a
a
a
a
a
a
a
a
a
a
a
a
Celsius,
∘
C
a
a
a
a
a
a
a
a
a
×
Notice that the temperature of the gas must be expressed in Kelvin in order to work, so make sure that you convert it before plugging it into the ideal gas law equation
∣
∣
∣
∣
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
a
a
T
[
K
]
=
t
[
∘
C
]
+
273.15
a
a
∣
∣
−−−−−−−−−−−−−−−−−−−−−−−−
Rearrange the ideal gas law equation to solve for
P
P
V
=
n
R
T
⇒
P
=
n
R
T
V
Plug in your values to find
P
=
0.325
moles
⋅
0.0821
atm
⋅
L
mol
⋅
K
⋅
(
35
+
273.15
)
K
4.08
L
P
=
∣
∣
∣
∣
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
a
a
2.0 atm
a
a
∣
∣
−−−−−−−−−−−
The answer is rounded to two sig figs, the number of sig figs you have for the temperature of the gas.
Answer:
[tex]\huge\boxed{\sf P = 1.68 \ atm}[/tex]
Explanation:
Given:
Moles = n = 0.6 mol
Volume = v = 9.13 L
Temperature = T = 38 °C + 273 = 311 K
Gas constant = R = 0.08206 L atm K⁻¹ mol⁻¹
Required:
Pressure = P = ?
Formula:
Pv = nRT
Solution:
Rearranging formula
[tex]\displaystyle P = \frac{nRT}{v} \\\\P = \frac{(0.6)(0.08206)(311)}{9.13} \\\\P = \frac{15.3}{9.13} \\\\P = 1.68 \ atm\\\\\rule[225]{225}{2}[/tex]
Define acid and base according to lewis theory, arrhenius theory and lawn theory
Answer:
Three principal theories about acid-base are,
1. Arrhenius theory
2. Bronsted-Lowry theory
3. Lux-Flood definition
4. Lewis theory
5. Usanovich definition
1. According to the Arrhenius, acids give up hydrogen ion in aqueous medium and a base give up hydroxyl ion in its aqueous medium. Examples are aqueous solution of HCl, CH3COOH, PhCOOH, and H2SO4. These give up H+ in an aqueous medium. Aqueous solutions of NaOH, Ca (OH)2 are Arrhenius bases.
Arrhenius theory has some limitations. This theory cannot explain the acidic nature of BF3 or basic behavior of NH3. This theory fails to give any explanation about acidity and basicity which does not produce H+ and OH- in their aqueous solutions.
2. According to the Bronsted-Lowry, an acid releases proton and a base accepts proton. NH3 accepts proton and forms ammonium ion, so ammonia acts as a base.
But this theory also has limitations. According to this theory acidic behavior of BF3 still cannot be explained.
3. Lux-Flood describes the acid-base theories based on oxide ion transformation. It gives clear explanation for acid-bases theories of non-protonic system. According to them, a base will donate the oxygen atom and an acid will accept oxygen atom.
4. According to the Lewis theory, acids are those substances which accept electron pair and base are those substances which donates electron pairs. Lewis theory can explain the acidic nature of BF3. In BF3, B is two electrons short to fulfil its octet. So it can accept a pair of electrons from an electron donating substituent. So it is an electron pair acceptor compound and acts as an acid.
Substances which have π electrons can donate electron pair to an electron deficient substance and acts as a base. Ethylene and acetylene is Lewis bases. AlCl3, PCl3 are Lewis acids.
5. According Usanovich, an acid is some chemical species which would react with bases and yields cations or accepts anions or electrons. A base is some chemical species which would react with acids, yield anions or electrons or combine with cations.
Explanation:
What happens to a catalyst as the result of a chemical reaction?
A.) It slows a chemical reaction.
B.) It is not consumed.
C.) It is consumed.
D.) It changes to something else.
The catalyst is recovered unchanged in amount and chemical composition at the end of a reaction. It speeds up only a spontaneous reaction, not a spontaneous one. It is not consumed in a reaction. The correct option is B.
What is a catalyst?A substance which increases the rate of a reaction without itself undergoing any permanent change chemically or quantitatively is defined as the catalyst and the phenomenon is known as the catalysis. It is believed that a catalyst actually participates in the chemical reaction that it speeds up.
A catalyst does not affect the position of equilibrium of a reversible reaction and thus do not alter its equilibrium constant. This is because it speeds up the forward and backward reactions to the same extent. It shows some specificity in its action.
It does not alter the Gibbs energy.
Thus the correct option is B.
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In Lhasa, Tibet, the elevation is 12,000 feet. The altimeter reading in an airplane is 19. 50 in Hg.
This pressure is equal to ___psi.
Given the data from the question, the reading (i.e pressure) of the altimeter in psi is 9.57 psi
Conversion scale1 inHg = 0.491 psi
Data obtained from the question Pressure (inHg) = 19.50 inHgPressure (psi) =? How to determine the pressure in psiThe pressure of the altimeter in psi can be obtained as illustrated below:
1 inHg = 0.491 psi
Therefore,
19.50 inHg = 19.50 × 0.491
19.50 inHg = 9.57 psi
Thus, 19.50 inHg is equivalent to 9.57 psi
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What does a coefficient tell you?
The coefficient tells you how many molecules of that substance there is.
An atom moving at its root mean square velocity at 100. °c has a wavelength of. Which atom is it? assume that the atom is the most abundant isotope of an element.
The atom that moves at its rms velocity at 100°C with a wavelength of 2.31 * 10 m is : SULPHUR ( s )
Determine the molar mass of the atomTo determine the atom we will have to determine the molar mass of the atom
Applying De Broglie equation
λ = h / mv
Vrms = [tex]\sqrt{\frac{3RT}{M} }[/tex] ---- ( 1 )
Where : λ = 2.31 * 10⁻¹¹, R = 8.314 J / k.mol, T = 373 K, h = 6.626 * 10⁻³⁴ J.s
From equation ( 1 )
M = ( h² Ua ) / 3RT*λ² --- ( 2 )
where : Ua ( mass of an atom ) = 6.022 * 10²³, h = 6.626 * 10⁻³⁴, R = 8.314 J / k.mol, λ = 2.31 * 10⁻¹¹, T = 373 K
Insert values into equation ( 2 )
M ( molar mass ) = 32 g/mol
Sulphur has a molar mass of 32 g/mol therefore the atom is sulphur.
Hence we can conclude that The atom that moves at its rms velocity at 100°C with a wavelength of 2.31 * 10 m is : SULPHUR ( s ).
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Nitrogen is contained in which of the following?
a. adenine.
b. cytosine.
c. guanine.
d. thymine. d. uracil.
Answer:
DNA contains four nitrogen bases: adenine, thiamine, guanine and cytosine. Adenine and thymine pair, and guanine and cytosine pair.
Explanation:
In combination, nitrogen is found in the rain and soil as ammonia and ammonium salts and in seawater as ammonium (NH4+), nitrite (NO2−), and nitrate (NO3−) ions...
hello people ~
Identify the type of plastic that can best be used to make electrical switches.
A. PVC
B. Polythene
C. PET
D. Bakelite
Answer:
Bakelite
Explanation:
Bakelite is a non recyclable plasticSimilar to Melamine it has some of very bad heat and electricity conducter.So it's used in electrical switcheswhat is the valency and symbol of chromium ?
Answer:
two valence states: trivalent chromium (Cr III) and hexavalent chromium (Cr VI)
hope this helps, i can change it if it doesn't.
How much heat will be absorbed in
boiling 5 grams of ice at 100°c and
at 1 atm?
Which bonds are formed when elements share electrons and form molecules?.
Answer:
A covalent bond
Explanation:
the atoms bond by sharing electrons. Covalent bonds usually occur between nonmetals. For example, in water (H2O) each hydrogen (H) and oxygen (O) share a pair of electrons to make a molecule of two hydrogen atoms single bonded to a single oxygen atom.
use shorthand method to represent the electrochemical reaction in a lead storage battery.
The shorthand equation shows us in a glance what happens in the electrochemical reaction. For a lead storage battery, we have; PbSO4(s)/H2O//Pb (s) ,PbO2(s) /H2SO4
What is an electrochemical reaction?An electrochemical reaction is one in which electrical energy is produced from a chemical reaction. The equations in a lead storage battery are;
Anode: Pb (s) + HSO4- → PbSO4(s) + H+ + 2 e-
Cathode: PbO2(s) + HSO4- + 3 H+ + 2 e- → PbSO4(s) + 2 H2O
Overall: Pb (s) + PbO2(s) + 2 HSO4- + 2 H+ → 2 PbSO4(s) + 2 H2O
Hence, the shorthand notation of this reaction is;
PbSO4(s)/H2O//Pb (s) ,PbO2(s) /H2SO4
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Using standard thermodynamic data at 298k, calculate the free energy change when 2. 34 moles of nh3(g) react at standard conditions
For a thermodynamic data at 298k, when 2. 34 moles of nh3(g) react at standard conditions, the free energy change is mathematically given as
dG'−213.174KJ
What is the free energy change?Generally, the equation for the Chemical Reaction is mathematically given as
HCL+NH3----->NH4Cl
Therefore
dG=-202.9-[-16.5+(95.3)]
dG=-91.1KJ/mol
In conclusion, For 2.34 moles
dG'=-91.1KJ/mol*2.34
dG'−213.174KJ
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The free energy change when 2.34 moles of NH₃(g) react at standard conditions is -213.174 kJ.
How do we calculate free energy change?Free energy change of any chemical reaction will be calculated by using the following chemical reaction:
ΔG = Free energy of products - Free energy of reactants
Given chemical reaction is:
NH₃ + HCl → NH₄Cl
From the stoichiometry of the reaction it is clear that same moles of ammonium chloride is produced by the same moles of ammonia & hydrochloric acid.
Free enrgy of NH₄Cl = -202.9 kJ/mol
Free enrgy of NH₃ = -16.5 kJ/mol
Free enrgy of HCl = 95.3 kJ/mol
On putting values in the above equation, we get
ΔG = -202.9-[-16.5+(95.3)]
ΔG = -91.1KJ/mol
For 2.34 moles, ΔG will be:
ΔG = (2.34)(-91.1) = -213.174 kJ
Hence required amount of free eenrgy is -213.174 kJ.
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really need help with this
This is a microscope.
Hope this clears that up for you.
4. The students predict that the reaction between hydrogen and sulfur will release a lot of energy. What question could help
provide support for the prediction?
Let's see
[tex]\\ \rm\rightarrowtail H_2+S=H_2S+Heat[/tex]
So
Observe the equation
it releases heat means it's exothermic
So
Question may include+Heatmay include ∆H=+veWhy is carbon dioxide called a gas and not vapour?
Explanation:
CO2 is called as gas because it exist in single thermodynamics state i.e CO exist in gases state only at room temperature.
A mixture of h2 and water vapor is present in a closed vessel at 20.00°c. the total pressure of the system is 755.0 mmhg. the partial pressure of the water vapor 17.50 mmhg. what is the partial pressure of h2? type in your answer using the correct number of significant figures. mmhg
The partial pressure is the pressure exerted by a single gas in a volume of the mixture. The partial pressure of dihydrogen is 737.5 mmHg.
What is Dalton's law?According to Dalton's law, the sum of partial pressure of non-reacting gases gives the total pressure of the system.
Given,
Total pressure = 755.0 mmHg
The partial pressure of water = 17.5 mmHg
The partial pressure of dihydrogen = ?
The partial pressure of dihydrogen is calculated as:
[tex]\begin{aligned}\rm p_{total} &= \rm p_{H_{2}O} + p_{H_{2}}\\\\755.0 &=\rm 17.5 + p_{H_{2}}\\\\&= 737.5 \;\rm mmHg\end{aligned}[/tex]
Therefore, the partial pressure of dihydrogen is 737.5 mmHg.
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Answer:
737.5Explanation:
At the top of a hill, an athlete on a skateboard has X joules of mechanical energy. How much mechanical energy will she have at the bottom of the hill? Ignore the effects of friction. X joules less than X joules more than X joules There is not enough information to know.
If an athlete has X joules of mechanical energy at the top of the hill, he will have the same X amount of energy at the bottom of the hill.
What is mechanical energy?Mechanical energy is the addition of kinetic and potential energy. It can be either kinetic or potential energy.
It is the energy possessed by the position or the motion of the body.
It is the energy present to perform any work.
So, the athlete will have X joule of energy at the top and bottom of the hill.
Thus, the correct option is a, X joules.
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Answer:
X Joules
Explanation:
The compound below is treated with chlorine in the presence of light. Draw the structure for the organic radical species produced by reaction of the compound with a chlorine atom. Assume reaction occurs at the weakest c-h bond.
Explanation:
A carbon radical is a reaction intermediate, which is produced during a free-radical reaction. These carbon radicals contain one unpaired electron on a carbon atom. Hence, these radicals are highly reactive in nature.
A free-radical reaction results in the production of a carbon radical as a reaction intermediate.
What is radical in chemistry?A radical in chemistry is indeed an atom, molecule, and ion that possesses one least one unpaired electron electron. The term "radical" is sometimes used to refer to a free radical. These unpaired electrons provide radicals, with a few exceptions, a high degree of chemical reactivity. Radicals frequently dimerize on their own. The majority of organic radicals have brief lives.
A free-radical reaction results in the production of a carbon radical as a reaction intermediate. One unpaired electron is present on the carbon atom in these radical forms of carbon. As a result, the nature of these radicals is very reactive.
Therefore, a free-radical reaction results in the production of a carbon radical as a reaction intermediate.
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