- #1
zaf
Hello forum members
I have a HW problem on ploting a P-V digram, I worked out a solution..can someone have a look at it and let me know if I am correct
the Question is as follows
2 moles of a monatomic ideal gas initially occupies a volum of 100 liters at a pressure of 100 KPa. The gas then expands iobarically to 200 liters (leg 1->2), followed by an isometric pressure increase to 300 KPa (leg 2-3), and ending in an isobaric expansion to 300 liters (leg 3->4).
Find change in U (internal energy) for each leg
Find W (work) for each leg
Find Q (heat exchange) for each leg
here is part of the solution
T1 = (100000 * .10) / (8.314 * 2) = 601 K
U1 = (3/2)*2*8.31*601 = 14982 J
T2 = (100000 * .20) / (8.31 * 2) = 1203 K
U2 = (3/2)*2*8.31*1203 = 29990 joules
Therefore
U for leg 1->2 is +15008.79 joules
W for leg 1-2 would be 10000 joules, which is P times change in volume
Am i correct so far...if that is so...then i can solve the rest
Zaf
I have a HW problem on ploting a P-V digram, I worked out a solution..can someone have a look at it and let me know if I am correct
the Question is as follows
2 moles of a monatomic ideal gas initially occupies a volum of 100 liters at a pressure of 100 KPa. The gas then expands iobarically to 200 liters (leg 1->2), followed by an isometric pressure increase to 300 KPa (leg 2-3), and ending in an isobaric expansion to 300 liters (leg 3->4).
Find change in U (internal energy) for each leg
Find W (work) for each leg
Find Q (heat exchange) for each leg
here is part of the solution
T1 = (100000 * .10) / (8.314 * 2) = 601 K
U1 = (3/2)*2*8.31*601 = 14982 J
T2 = (100000 * .20) / (8.31 * 2) = 1203 K
U2 = (3/2)*2*8.31*1203 = 29990 joules
Therefore
U for leg 1->2 is +15008.79 joules
W for leg 1-2 would be 10000 joules, which is P times change in volume
Am i correct so far...if that is so...then i can solve the rest
Zaf