Ideal Gas Law
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100
A sample container of CO occupies a volume of 440 mL at a pressure of 1452 mmHg and a temperature of 345 K. What would the temperature be if the volume changed to 5.34 L and the pressure changed to 3 atm?
6.58E3 K
100
A mixture of gasses at 760.0 torr contain 25% nitrogen, 46% oxygen, and 29% carbon dioxide by volume. What is the pressure of the carbon dioxide gas in torr?
220.4 torr
100
If the internal energy of a thermodynamic system is increased by 300 J while 75 J of expansion work is done on it, how much heat was transferred and in which direction (to/from the system)?
375 J of heat transferred to the system
100
List the following intermolecular forces from strongest to weakest: dipole-dipole, london dispersion, and hydrogen bonding.
Hydrogen bonding > dipole-dipole > london dispersion
100
What is the process of transitioning from gas to liquid called?
Condensation
200
A certain gas has a density of 4.34 g/L at 273 degrees K and 1 atm. What is the molar mass of the gas?
97.23 g/mol
200
If you have two gasses at the same temperature, pressure, and volume in two separate containers, which of the following is true about the moles of gas in each container?
A- Moles of gas 1 > gas 2
B- Moles of gas 1 < gas 2
C- Moles of gas are equal
D- Not enough information to decide.
C
200
Which of the following is/are true:
a- If work is done by a system, w > 0
b- internal energy is a state function but q is not
c- the internal energy of a system changes only when heat is gained or lost by the system.
B
200
A sample of nickel is heated to 99.88 C and placed in a coffee-cup calorimeter containing 150.0 g of water at 23.58 C. After the metal cools, the final temperature of the metal and water mixture is 25.08 C. If the specific heat capacity of nickel is 0.444 J/C*g, what mass of nickel was originally heated? Assume no heat loss to surroundings.
28 g Ni
200
How many atoms are in each unit cell type (simple cubic, body-centered cubic, and face-centered cubic)?
Respectively 1, 2, 4
300
The mass of 560 cm³ of an unknown gas is 1.60 g at STP. Which of the following gasses is it: O₂, Cl₂, or SO₂?
SO2
300
A 2.5 atm sample of N₂ effuses through a small opening in 2.0 minutes. If a sample of an unknown gas under the same conditions takes 4.2 minutes to effuse, what is the unknown gas’s molar mass?
123.5 g/mol
300
A bomb calorimeter’s heat capacity was determined by burning 6.79 g of methane in the bomb. Methane has an enthalpy of combustion of -802 kj/mol. The temperature changed by 10.8 C. What is the heat capacity of the bomb calorimeter?
31.4 kJ/C
300
A certain flexible weather balloon contains helium gas at a volume of 855 L. Initially, the balloon is at sea level where the temperature is 25.8 C and the pressure is 730 torr. The balloon then rises to an altitude of 6,000 feet, where the pressure is 605 torr and the temperature is 15.8 C. What is the change in volume of the balloon as it ascends from sea level to 6,000 feet?
The volume decreases by 223.2 L
300
Which compound will have a greater boiling point: C₂H₄, or C₄H₁₂?
C₄H₁₂
400
A particular balloon is designed by its manufacturer to be inflated to a volume of no more than 2.5 L. If the balloon is filled with 2.0 L of helium at sea level (1 atm), and rises to an altitude at which the atmospheric pressure is only 500 mmHg, will the balloon burst? Assume the temperature is constant.
Yes, the balloon will burst. The volume will be approximately 3 L.
400
Under what conditions do real gasses behave most like ideal gasses?
Low pressure, high temperature
400
Two pieces of the same metal at the same weight are placed inside a coffee-cup calorimeter. The first piece of metal is at 45 C and the second is at 73 C. Assuming the specific heat of the metal is 2.34 J/g*K, what is the final temperature inside the coffee-cup?
59 C
400
It has been determined that the body can generate 5500 kJ of energy during one hour of strenuous exercise. Perspiration is the body’s mechanism for eliminating this heat. What mass of water in grams would have to be evaporated through perspiration to rid the body of the heat generated during 2 hours of exercise? The heat of vaporization of water is 40.6 kJ/mol.
4880.9 g water
400
Draw a phase diagram. Include all labels including: Liquid, Gas, Solid, critical point, triple point, and axis labels.
500
An unknown diatomic gas has a density of 3.164 g/L at STP. What is the identity of the gas?
Cl2
500
DAILY DOUBLE
Higher than. If the pressure is held constant, the volume of water must increase to match the same pressure because water has a lower density.
500
The enthalpy of combustion of solid carbon to form carbon dioxide is 2393.7 kJ/mol C, and the enthalpy of combustion of carbon monoxide to form carbon dioxide is 2283.3 kJ/mol CO. From this data, calculate the ΔH for the reaction 2C + O₂ → 2CO. Hint- you should write BALANCED chemical equations for the first two enthalpy values.
220.8 kJ
500
Calcium has a cubic closest packed structure as a solid. Assuming that calcium has an atomic radius of 197 pm, calculate the density of solid calcium in g/cm³.
1.54 g/cm³
500
Freon-12 is a commonly used refrigerant in central home air conditioners. The system is initially charged to a pressure of 4.8 atm. Express this pressure in each of the following units: mmHg, torr, Pa.
3.6E3 mmHg, 3.6E3 torr, 4.9E5 Pa