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An ideal gas expands against a constant ...

An ideal gas expands against a constant external pressure of 2.0 atmosphere from 20 litre to 40 litre and absorbs 10 kJ of heat from surrounding. What is the change in internal energy of the system? (Given : 1 atm-litre = 101.3 J)

A

4052 J

B

5948 J

C

14052 J

D

9940 J

Text Solution

Verified by Experts

The correct Answer is:
B
`W = -P_("ext") (V_(2)-V_(1)) = -2 xx 20 = -40 lt -atm`
`=-40 xx 101.3 J =-4052` J
`DeltaU = q+w = 10000 - 4052 = 5948` J
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