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Q.

A gas absorbs 300 J of heat energy and expands by 600 cm3 against a constant pressure of 2×105Nm-2.  The change in internal energy is : (1Nm=1J).

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a

+420 J 

b

-180 J

c

+180 J

d

-420 J

answer is C.

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Detailed Solution

ΔU=q+w,  q=300J,w=-PΔV,  P=2×105Nm-2

ΔV=600cm3=600×10-6m3

w=-2×105×600×10-6=-120Nm=-120J

ΔU=300-120=180J

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