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140 grams of nitrogen absorbs 60 calories of heat without change in volume. If the temperature increases from 27oC to 30oC while doing so then what is the value of molar heat capacity?
(A) 2 cal K−1 mol−1
(B) 4 cal K−1 mol−1
(C) 5 cal K−1 mol−1
(D) 20 cal K−1 mol−1
As the gas absorbs heat without change in volume \ W = 0 ( V = 0)
Heat absorbed, q = 60 calories
Since ?E = q + W = 60 + 0 = 60 cal
Cv (heat capacity at constant volume)
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