Please explain me this G-Chem concept

[luv8724]

---

Members do not see this ad.

Two ideal gas, A and B, are at the same temp, V and P. Gas A is reversibly expanded at constant T to a volume V. Gas B is allowed to expand into an evacuated chamber until it also has total volume V, but without exhanging heat with its surroundings, Which of the following most accurately describes the two gases:

a) Gas A has a higher temp and enthalpy than gas B
b) Gas A has a higher temp but a lower enthalpy than gas B
c) Gas B has a higher temp and enthalpy than gas A
d) Gas A and B have equal temp and enthalpies

Is this something like we might see on DAT? or is this too deep.

 

[UndergradGuy7]

Two ideal gas, A and B, are at the same temp, V and P. Gas A is reversibly expanded at constant T to a volume V. Gas B is allowed to expand into an evacuated chamber until it also has total volume V, but without exhanging heat with its surroundings, Which of the following most accurately describes the two gases:

a) Gas A has a higher temp and enthalpy than gas B
b) Gas A has a higher temp but a lower enthalpy than gas B
c) Gas B has a higher temp and enthalpy than gas A
d) Gas A and B have equal temp and enthalpies

Is this something like we might see on DAT? or is this too deep.

Whats the answer?

 

[sfoksn]

I don't exact understand the question..

Is the answer B?

Cuz if A expands to the volume V, it would lose enthalpy.. I think. But it stays at same Temp regardless because it says so.

B expands to volume V, and enthalpy change would be 0 because heat is contained. But when volume of gas increase, its temperature goes down, so its temperature should be less than A, I think...

 

[luv8724]

D is the answer it says..

 

[sfoksn]

Haha okay.
I think this question has too much physics involved for DAT. It may be on MCAT haha

 

[luv8724]

I feel like ****ing EK questions are messing me up!!