17. Which of the following would have a zero AH°?A) Hg(g)B) F(g)C) N2(g)D) He(1)E) 12(g)18. A sample of helium gas occupies a sealed container. What would happen to the volume if the pressurewas halved at a constant temperature?A) volume would increase by 12B) volume would doubleC) volume would decrease by ½D) volume would decrease byE) volume would decrease by some other factor19. Which of the following processes always results in a decrease in the energy of a system(AE)?A) The system loses heat and does work on the surroundings.E)B) The system gains heat and has work done on it by the surroundings.C) The system gains heat and does work on the surroundings.D) The system loses heat and has work done on it by the surroundings.E) None of these is always true.20. A sample of chlorine vapor has a density of 3.60 g/L at a temperature of -15.0°C. Calculate thepressure of the chlorine vapor at these conditions. PV =nRT (R = 0.0821 L*atm/mol*K)A) 47.5 torrE) 4585 torrB) 1635 torrC) 442 torrD) 817 torr

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17. Which of the following would have a zero AH? A) Hg(g) B) F(g) C) N2(g) D) He(1) E) 12(g)

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Question

17. Which of the following would have a zero AH°?
A) Hg(g)
B) F(g)
C) N2(g)
D) He(1)
E) 12(g)
18. A sample of helium gas occupies a sealed container. What would happen to the volume if the pressure
was halved at a constant temperature?
A) volume would increase by 12
B) volume would double
C) volume would decrease by ½
D) volume would decrease by
E) volume would decrease by some other factor
19. Which of the following processes always results in a decrease in the energy of a system(AE)?
A) The system loses heat and does work on the surroundings.
E)
B) The system gains heat and has work done on it by the surroundings.
C) The system gains heat and does work on the surroundings.
D) The system loses heat and has work done on it by the surroundings.
E) None of these is always true.
20. A sample of chlorine vapor has a density of 3.60 g/L at a temperature of -15.0°C. Calculate the
pressure of the chlorine vapor at these conditions. PV =nRT (R = 0.0821 L*atm/mol*K)
A) 47.5 torr
E) 4585 torr
B) 1635 torr
C) 442 torr
D) 817 torr

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