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Q.

Two mole of an ideal gas is heated at constant pressure of one atmosphere from 27°C to 127°C. If Cv,m = 20 + 10-2 T JK-1 mol-1, then q and ∆U for the process are respectively:

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a

6362.8 J, 4700 J

b

3037.2 J, 4700 J

c

7062.8 J, 5400 J

d

3181.4 J, 2350 J

answer is A.

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Detailed Solution

w=−nRΔT=−2×8.314×100=−1662.8JΔU=n∫300400 20+10−2TdT=22×100+10−224002−3002=4700J4700 = q -1662.8∴q=6362.8J
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