A gas can be taken from a to b via two different processes acb and adb. When path acb is used 60 j of heat flows into the system and 30 j of work is done by the system. If path adb is used work done by the system is 10 j. The heat flow into the system in path adb is :
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Answer:
q = 40 J
Explanation:
Case I (path acb):
q = 60 J
w= -30 J (as work is done by the system)
ΔU = q + w
ΔU = 60 + (-30)
ΔU = 30 J
Case II (path adb):
q = ?
w= -10 J (as work is done by the system)
ΔU = 30 J (ΔU will remain same as it is a state function)
So,
ΔU = q + w
30 = q + (-10)
q = 30 + 10
q = 40 J
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