CHEM 162 FINAL EXAM QUESTIONS
AND ANSWERS
Classify the type of electrolyte: CH3OH(l) → CH3OH(aq) - Correct Answers -Non
electrolyte
What is the molar mass of a gas that has a density of 0.179 g/L at STP? - Correct
Answers -4 (conversion factor 22.4L/mol)
The pressure of a gas is 1.10 atm. What is its pressure in mmHg? - Correct Answers -
836 (1 atm = 760 mm Hg or torr)
Classify the type of electrolyte: HF(g) ↔ H+(aq) + F-(aq) - Correct Answers -weak
A gas mixture containing oxygen, nitrogen, and neon exerts a total pressure of
600mmHg. If the partial pressure of nitrogen is 210mmHg and partial pressure of neon
is 100mmHg, what is the partial pressure of oxygen? - Correct Answers -290 (600-210-
100=290)
The density of (1 mol) C3H8 gas at STP is: - Correct Answers -1.96 (Molar mass /Molar
volume) Molar vol = 22.4L/mol
The numerical value for the gas constant in mmHg, liters, Kelvins, and moles is: -
Correct Answers -0.08206
250 ml of O2 is collected over water at 1.20 atm and 50oC. Calculate the volume of
O2(dry) at STP. - Correct Answers -228
Calculate the molar mass of a gas that effuses at a rate 0.85 times O2 - Correct
Answers -44
Two liquids , A and B, are placed in two separate closed containers. When the vapor
and liquid have established equilibrium in the containers, the vapor pressure of A is
higher than that of B. - Correct Answers -A more volatile than B
At STP, 12.69 g of a noble gas occupies 14.09 L. What is the identity of the noble gas?
- Correct Answers -Ne (molar mass*specific volume(X)= molar volume at the
temperature given(V)) (X= g/L)
AND ANSWERS
Classify the type of electrolyte: CH3OH(l) → CH3OH(aq) - Correct Answers -Non
electrolyte
What is the molar mass of a gas that has a density of 0.179 g/L at STP? - Correct
Answers -4 (conversion factor 22.4L/mol)
The pressure of a gas is 1.10 atm. What is its pressure in mmHg? - Correct Answers -
836 (1 atm = 760 mm Hg or torr)
Classify the type of electrolyte: HF(g) ↔ H+(aq) + F-(aq) - Correct Answers -weak
A gas mixture containing oxygen, nitrogen, and neon exerts a total pressure of
600mmHg. If the partial pressure of nitrogen is 210mmHg and partial pressure of neon
is 100mmHg, what is the partial pressure of oxygen? - Correct Answers -290 (600-210-
100=290)
The density of (1 mol) C3H8 gas at STP is: - Correct Answers -1.96 (Molar mass /Molar
volume) Molar vol = 22.4L/mol
The numerical value for the gas constant in mmHg, liters, Kelvins, and moles is: -
Correct Answers -0.08206
250 ml of O2 is collected over water at 1.20 atm and 50oC. Calculate the volume of
O2(dry) at STP. - Correct Answers -228
Calculate the molar mass of a gas that effuses at a rate 0.85 times O2 - Correct
Answers -44
Two liquids , A and B, are placed in two separate closed containers. When the vapor
and liquid have established equilibrium in the containers, the vapor pressure of A is
higher than that of B. - Correct Answers -A more volatile than B
At STP, 12.69 g of a noble gas occupies 14.09 L. What is the identity of the noble gas?
- Correct Answers -Ne (molar mass*specific volume(X)= molar volume at the
temperature given(V)) (X= g/L)
