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25/09/2021 5:18 pm
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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 surroundings. What is the change in internal energy of the system? (given : 1atm-litre = 101.3 J)
(a) 4052 J
(b) 5948 J
(c) 14052 J
(d) 9940 J
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25/09/2021 5:19 pm
Correct answer: (b) 5948 J
Explanation:
ΔU = q + w
= 10 × 1000 - 2 × (20) × 101.3
= 5948 J