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  4. The molar specific heat at constant pressure of an ideal gas is (7 / 2) R. The ratio of specific heat at constant pressure to that at constant volume is

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Q. The molar specific heat at constant pressure of an ideal gas is $(7 / 2) R$. The ratio of specific heat at constant pressure to that at constant volume is

Thermal Properties of Matter

Solution:

$C_{p}=\frac{7}{2} R$
$C_{V}=C_{p}-R$
$=\frac{5}{2} R$
$\therefore \frac{C_{p}}{C_{V}}=\frac{7}{5}$