First slide

Specific heat

Question

Heat is supplied to a monoatomic ideal gas which expands at constant pressure. Fraction of heat that goes into work done by the gas is:

Easy

A

1
B

$\frac{2}{3}$
C

$\frac{3}{5}$
D

$\frac{2}{5}$

Solution

$\frac{W}{Q} = \frac{nR ∆ T}{{nC}_{p} ∆ T} = \frac{R}{C_{p}} = \frac{R}{5 / 2 R} = \frac{2}{5}$

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