What is occurring in section D?
heating curve phase changes
A. Particles of a gas are condensing into a solid.
B. Temperature of a gas is decreasing.
C. Temperature of a liquid is rising.
D. Particles of a gas are condensing into a liquid
Answer:
B. Temperature of a gas is decreasing.
C. Temperature of a liquid is rising.
D. Particles of a gas are condensing into a liquid
Explanation:
Simply, the diagram shows physical changes of a substance.
- Region A: we see the substance is very compacted with very closely attached molecules which characterizes solids.
Transition A—C (Region B):
[tex]{ \red{ \dashrightarrow{ \rm{ \: melting}}}} \\ { \blue{ \dashleftarrow{ \rm{ freezing}}}}[/tex]
From A to C, a solid is changing to liquid state by melting down and the reverse process is freezing.
Melting may be cause by increasing pressure and increasing the temperature of the substance. And freezing is the opposite.
- Region C: We see the substance has molecule further apart than in A. This characterizes liquid feature.
Transition C—E (Region D):
[tex]{ \red{ \dashrightarrow{ \rm{ \: evaporation}}}} \: \\ { \blue{ \dashleftarrow{ \rm{ condensation}}}}[/tex]
From C to E, liquid is changing to gaseous state by evaporation down and the reverse process is condensation. Evaporation occurs due to increase in pressure and temperature of the liquid, and condensation is the opposite.
- Region D
The molecules are furthest apart. This characterizes gaseous feature.
Note that also E can change to A and vice versa directly by sublimation.
I want to make a precipitate from C4 H6 O4Sr and K3 PO4. Is this possible and if so, how do I do this?
Choose one of the careers in the Information and Support Services career pathway and discuss how this job has evolved over time. How has this change impacted our society?
The Information and Support Services career pathway is an expansive field that has seen many changes over the years. One such career is IT support technicians.
What is society?Society is a group of individuals living together in an organized manner, interacting with one another, and sharing a common culture. It is a complex system through which people interact with each other, form relationships, and build communities.
This job, which originally focused on the installation and maintenance of computer hardware and software, has evolved over time to encompass a much wider range of responsibilities.
Today, IT support technicians not only install and maintain hardware and software, but are also responsible for providing technical support to users, troubleshooting problems, setting up networks, and implementing security measures. They are also responsible for creating and managing databases, configuring and managing software applications, and monitoring system performance. This shift from hardware and software installation to a more comprehensive and technical role has had a significant impact on our society.
The increased complexity of IT systems and the need for sophisticated technical knowledge has meant the job of IT support technicians has become more important than ever. These technicians are now essential to the functioning of businesses, governments, and other organizations, as they are responsible for helping to ensure their systems and networks remain secure and operational. They are also important in helping organizations maximize the efficiency of their systems and ensuring that their users have access to the information they need.
The changing role of IT support technicians has had a positive effect on our society by providing increased access to technology and more widespread adoption of digital services. As more organizations move their operations to the cloud, IT support technicians will be essential in helping them ensure that their systems remain secure and efficient. Furthermore, their knowledge and expertise will be invaluable in helping to protect users from malicious attacks and ensuring that data is kept secure.
Overall, IT support technicians have seen their roles evolve over time, and this evolution has had a positive impact on our society. They are now essential to the functioning of businesses, governments, and other organizations, and their expertise is invaluable in helping ensure the safety and security of our networks, data, and users.
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Lysozyme is an enzyme that breaks bacterial cell walls. A
solution containing 0.150 g of this enzyme in 210 mL of
solution has an osmotic pressure of 0.953 torr at 25 °C.
What is the molar mass of lysozyme?
If Lysozyme is an enzyme that breaks bacterial cell walls. The molar mass is: 1.40×104 g/mol..
How to find the molar mass?Osmotic pressure (Π):
Π = M × R × T
where:
M is the molarity of the solution
R is the ideal gas constant
T is the absolute temperature.
So,
M = Π / (R × T)
Π = 0.953 torr × (0.001316 atm / 1 torr) = 0.001254 atm
R = 0.0821 atm L mol-1 K-1
T = 25.0°C + 273 = 298 K
Molarity of lysozome solution = (0.001254 atm) / (0.0821 atm L mol-1 K-1 × 298 K) = 0.00005126 mol/L
Molarity of lysozome solution = 0.00005 mol/L
(0.15 g lysozome) × (1 L soln/ 0.00005126 mol lysozome) × (1 / 0.21 L soln) = 13934.56 g/mol
Molar mass of lysozome = 13934.56 g/mol
Molar mass of lysozome = 1.40×104 g/mol.
Therefore the molar mass of lysozome is 1.40×104 g/mol.
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A room temperature 0.213 M solution of an unknown monoprotic acid has a pH of 1.862. What is the percent ionization of that unknown acid?
The percent ionization of the unknown monoprotic acid is 7.51%.
What is Room Temperature?
Room temperature is a range of temperatures that is comfortable for humans to be in for extended periods of time, typically between 20-25 degrees Celsius (68-77 degrees Fahrenheit). However, the definition of room temperature can vary depending on cultural and regional norms, as well as the specific application. In scientific contexts, room temperature is often defined more precisely, for example as 20-22 degrees Celsius (68-72 degrees Fahrenheit) in laboratory settings.
The percent ionization of an acid is defined as the ratio of the concentration of ionized acid (H+) to the initial concentration of the acid (HA) multiplied by 100%.
% Ionization = [H+]/[HA] x 100%
The concentration of H+ in a solution can be calculated from the pH using the formula:
pH = -log[H+]
Rearranging this equation gives:
[H+] = 10^(-pH)
Substituting the given values of pH = 1.862 and the initial concentration of the acid [HA] = 0.213 M into these equations, we get:
[H+] = 10^(-1.862) = 0.016 M
% Ionization = [H+]/[HA] x 100% = (0.016 M/0.213 M) x 100% = 7.51%
Therefore, the percent ionization of the unknown monoprotic acid is 7.51%.
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20 mL of CH4 (g) is burned together with 80 mL of O₂ (g), measured under the same
conditions of temperature and pressure. At the end of the reaction:
CH4 (g) + 2 O₂ (g) → CO₂ (g) + 2 H₂O (g)
What is the percentage composition by volume of the gaseous mixture?
40% CH4.20% CO2.40% H₂O
33% CO2 , 66% H2O
40% O2, 20% CO₂, 40% H₂O
25% CH4,25% O₂, 25% CO2. 25% H₂O
25% CH4 50% O2,25% CO2
The correct answer is 25% CH4, 50% O2, 12.5% CO2, and 25% H2O by percentage composition.
What is the chemical equation and we assume what?According to the chemical equation, for every molecule of CH4 burned, we need two molecules of O2. So we can assume that we have 10 mL of CH4 and 40 mL of O2, which will react completely.
Using the ideal gas law, we can find the number of moles of each gas present:
n(CH4) = (0.020 L)(1.00 atm)/(0.0821 L atm/mol K)(298 K) = 0.000964 mol
n(O2) = (0.080 L)(1.00 atm)/(0.0821 L atm/mol K)(298 K) = 0.00386 mol
From the balanced equation, we see that the volume ratio of CH4 to CO2 to H2O is 1:1:2. Therefore:
n(CO2) = n(CH4) = 0.000964 mol
n(H2O) = 2n(CH4) = 0.00193 mol
The total number of moles in the mixture is:
n(total) = n(CH4) + n(O2) + n(CO2) + n(H2O) = 0.000964 + 0.00386 + 0.000964 + 0.00193 = 0.00772 mol
The percentage composition by volume of each gas is equal to the number of moles of the gas divided by the total number of moles, multiplied by 100%:
% CH4 = (0.000964 mol/0.00772 mol) x 100% = 12.5%
% O2 = (0.00386 mol/0.00772 mol) x 100% = 50%
% CO2 = (0.000964 mol/0.00772 mol) x 100% = 12.5%
% H2O = (0.00193 mol/0.00772 mol) x 100% = 25%
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Choose the formula for the compound tribromide decaoxide.
Choose the formula for the compound trinitrogen octachloride.
Choose the formula for the compound octaselenium heptaoxide.
Choose the formula for the compound disilicon nonachloride.
Choose the formula for the compound nitrogen monofluoride.
Choose the formula for the compound carbon tetrachloride.
The formulas for the given compounds are:
Tribromide decaoxide: Br₃O₁₀Trinitrogen octachloride: N₃Cl₈Octaselenium heptaoxide: Se₈O₇Disilicon nonachloride: Si₂Cl₉Nitrogen monofluoride: NFCarbon tetrachloride: CCl₄What is the formula of a compound?A chemical formula is a representation of the chemical composition of a substance using symbols for the elements and numerical subscripts to indicate the number of atoms of each element present in a molecule or an ionic compound. It is a shorthand way of describing the identity and ratio of the elements in a substance.
The formula for a compound indicates the type and number of atoms in the simplest unit of the substance.
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how much ice can be melted with 560 joules of heat?
The amount of ice that can be melted by a given amount of heat depends on several factors, such as the mass of the ice, the specific heat capacity of ice, and the heat of fusion of ice (the amount of heat required to melt a given mass of ice at its melting point).
Assuming that the ice is at its melting point (0°C or 32°F) and that the heat is used solely to melt the ice (not to raise its temperature), we can use the heat of fusion of ice and the equation:
Q = m * L
where Q is the heat required to melt the ice, m is the mass of the ice, and L is the heat of fusion of ice (334 J/g).
To find the mass of ice that can be melted with 560 J of heat, we can rearrange the equation to solve for m:
m = Q / L
m = 560 J / 334 J/g
m = 1.67 g
Therefore, 560 joules of heat can melt 1.67 grams of ice at its melting point.
Answer:
The amount of ice that can be melted with a certain amount of heat depends on several factors such as the mass of the ice, the initial temperature of the ice, and the specific heat capacity of ice.
However, assuming we are dealing with a certain amount of ice with a specific mass and initial temperature, we can use the following formula:
Q = m × Lf
where Q is the amount of heat required to melt the ice, m is the mass of the ice, and Lf is the heat of fusion of ice, which is equal to 334 joules/gram.
To find the amount of ice that can be melted with 560 joules of heat, we need to rearrange the formula as:
m = Q ÷ Lf
Plugging in the values, we get:
m = 560 J ÷ 334 J/g ≈ 1.67 g
Therefore, 560 joules of heat can melt approximately 1.67 grams of ice.
Explain how matter relates to life
Answer:
matter are anything that has space
The wind blows a lawn chair that weighs 4 kg into a fence with a force of 8 N. How much reaction force does the fence exert on the chair.
A. 2N
B. 0.5 N
C. 0 N
D.8 N
please help :(
i have no idea what this even means lol
Here are the answers for A and B.
Answer:
(a) 80% are metals.
(b) (1.) Metals are malleable and ductile. (2.) Metals are dense.
Explanation:
(a) If you look at the picture, there are faint lines dividing the circle into ten parts. Metals take up 8 sections and non-metals take up 2. This means that the number of metals on the periodic table takes up 80% and non-metals take up 20%.
(b) There are many physical properties of metals, but two of them are that metals are malleable & ductile (these relate to how metal can be shaped) and that metals are dense (density = mass ÷ volume).
16. Based on your knowledge of the scientific method, which statement identifies an observation?
• A. If my neighbor is burning leaves, then I should be able to see smoke because fire produces smoke
• B. I will check to see if smoke is coming from my neighbor's yard
• C. My neighbor is probably burning leaves
• D. I smell smoke when I walk outside.
An observation is that I can smell smoke as soon as I step outside.
Why is observation important?Keeping a close eye on someone or something is the act of observation, such as keeping a close eye on how the planets are moving. When you see or watch something and give it some thought, you can make an observation.
What is workplace observation?The Workplace Observation evaluation gauges an employee's capacity for observing, following, comprehending, and assessing processes, demonstrations, as well as other workplace practices.
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Provide the equation for the hydrolysis of propyl propanoate. Provide the equation for the hydrolysis N, N-dimethyl propanamide.
IF POSSIBLE MUST BE DONE ASAP.
Answer:
The hydrolysis reaction of propyl propanoate is as follows:
Propyl propanoate + Water → Propanoic acid + Propanol
The balanced chemical equation for this reaction is:
CH3CH2COOCH2CH2CH3 + H2O → CH3CH2COOH + CH3CH2CH2OH
The hydrolysis reaction of N, N-dimethyl propanamide is as follows:
N, N-dimethyl propanamide + Water → Propanoic acid + Dimethylamine
The balanced chemical equation for this reaction is:
CH3CH2CON(CH3)2 + H2O → CH3CH2COOH + (CH3)2NH
The acid-dissociation constant, Ka, for benzoic acid is 6.5 × 10-5. Which will you use to calculate the base-dissociation constant, Kb, for the conjugate base of benzoic acid?
Therefore, the value we will use to calculate the base-dissociation constant, Kb, for the conjugate base of benzoic acid is 1.54 × 10⁻¹⁰.
What is base-dissociation constant?The base dissociation constant, Kb, is a measure of the strength of a base in solution. It is the equilibrium constant for the reaction of a base with water to form the conjugate acid and hydroxide ion: B + H2O ⇌ BH+ + OH-. The Kb value is calculated by dividing the equilibrium constant for this reaction by the concentration of the conjugate acid and the concentration of hydroxide ion at equilibrium. Kb = [BH+][OH-] / [B] The Kb value can range from very small values (for weak bases) to very large values (for strong bases). The larger the value of Kb, the stronger the base. The Kb value is related to the acid-dissociation constant, Ka, for the conjugate acid of the base by the following relationship:
Kw = Ka × Kb
The Kb value is an important parameter in acid-base chemistry and is used to predict the degree of base ionization in solution, to calculate pH of basic solutions, and to determine the strength of bases in organic chemistry.
Here,
To calculate the base-dissociation constant, Kb, for the conjugate base of benzoic acid, we need to use the relationship between the acid-dissociation constant, Ka, and the base-dissociation constant, Kb, for a conjugate acid-base pair. The relationship is given by the following equation:
Ka × Kb = Kw
where Kw is the ion product constant for water, which is equal to 1.0 × 10⁻¹⁴ at 25°C.
Since we know the value of Ka for benzoic acid, which is 6.5 × 10^-5, we can use this equation to calculate the value of Kb for the conjugate base of benzoic acid:
Ka × Kb = Kw
Kb = Kw / Ka
Kb = 1.0 × 10⁻¹⁴ / 6.5 × 10⁻⁵
Kb = 1.54 × 10⁻¹⁰
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calculate the mass of magnesium needed to produce 72mL of hydrogen gas at a pressure of 755mmHg and a temperature of 20 celsius
4.16 g of element W reacts with 1.92 g of oxygen to form metal oxide W. The
empirical formula for this metal oxide is W203. What is the relative atomic mass of
W?
[Relative atomic mass : 0 = 16]
A 27
B 52
C 56
D 104
Answer:
52 grams (B)
Explanation:
Given: 4.16 grams of W
1.92 grams of O2
The reaction:
2W + 1.5 O2 ----> W2O3
We are gonna calculate the molar mass of W with ratios
So, to calculate that, we will multiply the moles by molar masses (O2: 1.5 * 32 & W: 2x) and divide the over the given masses and equating both fractions:
[tex]\frac{2x}{4.16} = \frac{1.5*32}{1.92}[/tex]
[tex]x = \frac{1.5*32*4.16}{2*1.92} = 52 grams[/tex]
Which of the following represents the greatest pressure?
O 0.625 atm
O 755 mmHg
O 15.10 PSI
O 90,250 Pa
The highest pressure, or 1.04 atm, or 15.10 PSI, is present.
What pressure level in Pa is high pressure?High pressure is often characterized by a barometer measurement of over 30.20 inHg and is linked to calm, clear skies. Above 30.20 inHg (102268.9 Pa or 1022.689 mb) indicates rising or stable pressure, which indicates continuous pleasant weather. Fair weather is a sign of slowly decreasing pressure.
0.625 atm
755 mmHg = 1 atm (by definition)
15.10 PSI = 1.04 atm (1 PSI = 0.068 atm)
90,250 Pa = 0.89 atm (1 Pa = 9.87x10^-6 atm)
Therefore, the greatest pressure is 1.04 atm, which corresponds to 15.10 PSI.
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How many liters of oxygen at STP are produced
from 1759 of water?
2 Cytot 1302 → 8C02 + 10H120
Answer:
the answer is 11.2 of oxygen at STP
Use this formula for the following questions: 3CaCl2
Underline the coefficient and circle the subscript.
How many calcium atoms?
How many total atoms in the formula?
1. The number of atoms of calcium in the compound is 1.806×10²⁴ atoms
2. The total atoms in the formula is 1.806×10²⁴ atoms
1. How do i determine the number of atoms?The number of atoms in the compound can be obtained as follow:
Formula of compound = 3CaCl₂Number of mole of Ca = 3 molesNumber of atoms =?1 mole of Ca = 6.02×10²³ atoms
Therefore,
3 moles of Ca = (3 moles × 6.02×10²³ atoms) / 1 mole
3 moles of Ca = 1.806×10²⁴ atoms
Thus, the number of atoms of calcium is 1.806×10²⁴ atoms
2. How do i determine the total atoms?The total atoms in the compound can be obtained as follow:
Formula of compound = 3CaCl₂Number of mole of compound = 3 molesTotal atoms =?1 mole of CaCl₂ = 6.02×10²³ atoms
Therefore,
3 moles of CaCl₂ = (3 moles × 6.02×10²³ atoms) / 1 mole
3 moles of CaCl₂ = 1.806×10²⁴ atoms
Thus, the total atoms is 1.806×10²⁴ atoms
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Describe two careers in the Information and Support Services pathway and the types of technology that each job uses. What is the function of an operating system?
An operating system is a piece of software that, among other things, controls peripheral devices like disc drives and printers as well as files, memory, processes, input, and output.
What are the various information technology career paths?Architecture, information security, programming, systems, networking, analyst, development, project management, or information systems management are all possible career paths.
What three professions fall under the umbrella of health informatics?Careers in health informatics incorporate ideas and techniques from information science, computer science, and healthcare. These specialists might serve as clinical analysts, health information specialists, and managers of computer systems. They can also pursue employment in applied research and higher education.
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Alcohol is less dense than water. If you measured the mass of the same volume of alcohol and water
If you measured the mass of the same volume of alcohol and water, alcohol will weigh less than water.
Density and weightsIf you measured the mass of the same volume of alcohol and water, you would find that alcohol has a lower mass than water.
This is because alcohol is less dense than water, which means that a given volume of alcohol weighs less than the same volume of water.
For example, if you measure 1 liter of water and 1 liter of alcohol, you will find that the mass of the water is greater than the mass of the alcohol.
This is because water has a higher density than alcohol. The density of water is about 1 gram per cubic centimeter, while the density of alcohol is about 0.79 grams per cubic centimeter. Therefore, the mass of the same volume of alcohol is lower than the mass of water.
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Matilda wants to buy some high-quality olive oil. She can buy 2 L bottle for $50, or she can buy 175 mL bottle for $5. In order to compare the prices, she needs to convert the volume of the second bottle to liters.
How many liters of olive oil are in the smaller bottle?
A. 1.75 L
B. 0.175 L
C. 175 L
D. 17.5 L
The volume of olive oil in the smaller bottle would be 0.175 L. Option B.
Dimensional analysisTo convert milliliters (mL) to liters (L), we divide by 1000. Therefore, 175 mL = 175/1000 L = 0.175 L.
The question is asking for the volume of the smaller bottle in liters, and we are given its volume in milliliters. So, we simply need to convert the volume from milliliters to liters.
The other answer choices are not correct because they are either too large or too small to be the volume of a small bottle of olive oil.
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If you combine 440.0 mL of water at 25.00 ∘C and 130.0 mL of water at 95.00 ∘C, what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.
final= ∘C
The final temperature of the mixture is 41.9. Mass has an impact on how much heat it can receive.
How to calculate final temperature?The mean of the two temperatures is referred to as the ultimate temperature when a mixture contains the same substance with the same mass. The quantity of heat necessary to raise the temperature of one gramme of a substance by one degree is known as a substance's specific heat.
The final heat of your substance can be calculated by adding the temperature difference to the starting point. Keep in mind that each object's mass.
mass has an impact on how much heat it can receive.
q = mCT
440 - 11,000 = 13,300 - 140 final temperature
580 = 24,300
final temperature = 41.9 C
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How many atoms of oxygen are present in 200.0 g of CaCO3 ?
Explanation:
firstly we find the mole of CaCO3 . Now, in CaCO3 1 mol CaCO3 contains 3 mol O . Hence, 36.138*10^23 atoms of oxygen are present in 200 g of caco3.
I need help with each one can you please show work
Answer:
1. 0.121 moles
2. 46.9 liters
3. 12.3 atm
4. 253 K
5. 0.552 g/L.
6. 22.8 g/mol.
7. 0.0494 moles
8. 5370 liters
9. 34.5 grams
10. helium
Explanation:
1. Using the ideal gas law equation, we can solve for the number of moles of oxygen:
PV = nRT
n = PV/RT
n = (1.2 atm) * (2.5 L) / [(0.0821 L atm/mol⚫K) * (298 K)]
n = 0.121 moles of oxygen
Therefore, 0.121 moles of oxygen will occupy a volume of 2.5 liters at 1.2 atm and 25°C.
2. Using the ideal gas law equation, we can solve for the volume of nitrogen:
PV = nRT
V = nRT/P
V = (2.0 moles) * (0.0821 L atm/mol⚫K) * (293 K) / (720 Torr)
V = 46.9 L
Therefore, 2.0 moles of nitrogen will occupy a volume of 46.9 liters at 720 Torr and 20°C.
3. Using the ideal gas law equation, we can solve for the pressure of CO:
PV = nRT
P = nRT/V
n = (25 g) / (28.01 g/mol) = 0.892 mol
P = (0.892 mol) * (0.0821 L atm/mol⚫K) * (298 K) / (0.5 L)
P = 12.3 atm
Therefore, 25 g of CO will exert a pressure of 12.3 atm at a temperature of 25°C and a volume of 500 mL.
4. Using the ideal gas law equation, we can solve for the temperature of Cl:
PV = nRT
T = PV/nR
n = (5.00 g) / (35.45 g/mol) = 0.141 mol
T = (900. Torr) * (0.750 L) / (0.141 mol) / (0.0821 L atm/mol⚫K)
T = 253 K
5. Therefore, 5.00 g of Cl will exert a pressure of 900. Torr at a volume of 750 mL at a temperature of 253 K.
Using the ideal gas law equation, we can solve for the density of NH3:
PV = nRT
n/V = P/RT
n/V = (800 Torr) / [(0.0821 L atm/mol⚫K) * (298 K)]
n/V = 0.0324 mol/L
The molar mass of NH3 is 17.03 g/mol, so the density of NH3 is:
density = (0.0324 mol/L) * (17.03 g/mol) = 0.552 g/L
Therefore, the density of NH3 at 800 Torr and 25°C is 0.552 g/L.
6. We can use the ideal gas law to calculate the number of moles of the gas and then divide the mass of the gas by the number of moles to get the molecular mass.
PV = nRT
n = PV/RT
n = (1.2 g/L) / [(0.0821 L atm/mol⚫K) * (293 K) * (745. Torr / 760 Torr)]
n = 0.0526 mol
The mass of the gas is 1.2 g, so the molecular mass is:
molecular mass = 1.2 g / 0.0526 mol = 22.8 g/mol
Therefore, the molecular mass of the gas is 22.8 g/mol.
7. Using the ideal gas law equation, we can solve for the number of moles of nitrogen gas:
PV = nRT
n = PV/RT
n = (6680 Torr) * (0.347 L) / [(0.0821 L atm/mol⚫K) * (300 K)]
n = 0.0494 moles of nitrogen gas
Therefore, 0.0494 moles of nitrogen gas will occupy a volume of 347 mL at 6680 Torr and 27°C.
8. We can use the ideal gas law to calculate the volume of hydrogen:
PV = nRT
V = nRT/P
n = (454 g) / (2.016 g/mol) = 225 mol
V = (225 mol) * (0.0821 L atm/mol⚫K) * (298 K) / (1.05 atm)
V = 5370 L
Therefore, 454 grams (1 lb.) of hydrogen will occupy a volume of 5370 liters at 1.05 atm and 25°C.
9. Using the ideal gas law equation, we can solve for the number of moles of CO:
PV = nRT
n = PV/RT
n = (785 Torr) * (32.5 L) / [(0.0821 L atm/mol⚫K) * (305 K)]
n = 1.23 moles of CO
The molar mass of CO is 28.01 g/mol, so the mass of CO is:
mass = (1.23 moles) * (28.01 g/mol) = 34.5 g
10. Therefore, 34.5 grams of CO will exert a pressure of 785 Torr at a volume of 32.5 L and a temperature of 32°C.
Using the ideal gas law equation, we can solve for the identity of the gas:
PV = nRT
n = PV/RT
n = (758 Torr) * (58.4 L) / [(0.0821 L atm/mol⚫K) * (275.5 K)]
n = 2.93 moles of gas
The mass of the gas is 10.3 g, so the molecular mass is:
molecular mass = 10.3 g / 2.93 mol = 3.52 g/mol
Looking at the periodic table, we see that the only element with a molecular mass close to 3.52 g/mol is helium, which has a molecular mass of 4.00 g/mol. Therefore, the gas is likely helium.
Zn + 2HCl → ZnCl2 + H2
How many moles of hydrogen are produced from the reaction of 2.3 moles of zinc?
Answer:
3 moles
Explanation:
Based on the balanced chemical equation, 1 mole of H2 is formed when 1 mole of Zn reacts with excess HCl. As such, 3 moles of H2 are formed when 3 moles of Zn react with excess HCl.
Write the acidic equilibrium equation for C₃H₇COOH. Be sure to include the proper phases for all species within the reaction.
Propionic acid, C3H7COOH, has an equation for its acidic equilibrium that looks like this: C₃H₇COOH (aq) + H₂O (l) ⇌ C₃H₇COO⁻ (aq) + H₃O⁺ (aq).
Which three equilibrium equations are there?A system must satisfy the three equations of equilibrium, Sum Fx = 0, Sum Fy = 0, and Sum M = 0, in order to be in equilibrium. Start with the equations for the sum of the forces. Dividing the diagonal forces into their component parts would be the most straightforward technique to solve these force systems.
What is an illustration of a reaction in equilibrium?The chemical reaction between the reactants both before and after the reaction is complete is referred to as an equilibrium reaction (i.e., a thermodynamic equilibrium state). The evaporation of water into vapor is an illustration of an equilibrium reaction.
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How many grams are there in 6 moles of water??
Answer:108.06 grams
Explanation: the first step is to use unit conversions. Multiply the given number of moles by the molar mass of water which is 15.99 grams of oxygen plus 2.02 grams for two hydrogen that will turn it into grams and that will give you your total number of grams.
A sample of the compound has 9 grams of cobalt. How many grams of fluorine does the sample have?
The mass (in grams) of fluorine the sample have is 2.91 g
How do I determine the mass of fluorine?First, we shall determine the mole of 9 grams of cobalt. Details below:
Mass of cobalt = 9 grams Molar mass of cobalt = 58.93 g/mol Mole of cobalt =?Mole = mass / molar mass
Mole of cobalt = 9 / 58.93
Mole of cobalt = 0.153 mole
Finally, we shall determine the mass of fluorine the present in the compound. Details below:
Molar mass of fluorine = 19 g/mol Mole of cobalt = 0.153 moleMole of fluorine = Mole of cobalt = 0.153 moleMass of fluorine = ?Mole = mass / molar mass
0.153 = Mass of fluorine / 19
Cross multiply
Mass of fluorine = 0.153 × 19
Mass of fluorine = 2.91 g
Thus, the mass of fluorine is 2.91 g
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Neurological differences in singing
alone or with others
Alone on the left, and with others on the right. Welsh, 2015.
Which of the following conclusions can be drawn from the brain scan images?
SOBRE
Singing alone is less fun than singing with others.
Singing with others activates more regions of the brain.
Singing alone activates more regions of the brain.
Singing alone is a requirement of singing with others.
Which of the following is evident in the brain scans?
0000
There is no difference in brain activity when singing alone or singing with others.
Singing with others is an important task.
Singing alone and singing with others activate different parts of the brain.
Loud music activates the most parts of the brain.?
1) Singing alone is less fun than singing with others
2) Loud music activates the most parts of the brain
Can a brain scan during singing show important information?Brain scans during singing can provide important information about the neural processes involved in music and vocalization.
Brain scans during singing can help researchers understand how these different brain regions interact and coordinate during vocalization. For example, studies have shown that professional singers have greater activation in the motor cortex and auditory cortex compared to non-singers, suggesting that extensive training can lead to changes in the brain's neural circuits.
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