Heat Capacity

Question

Molar heat capacity at constant volume C_v for ideal monoatomic gas equals:

RankGuru · Accepted Answer

For an ideal gas, the molar heat capacity at constant volume ($C_v$) is related to the degrees of freedom ($f$):
$C_v = \frac{f}{2} R$
- For a **monoatomic** gas (e.g., Helium, Argon), there are 3 translational degrees of freedom and no rotational/vibrational ones ($f=3$).
- Therefore, $C_v = \frac{3}{2} R$.
Note: $C_p = C_v + R = \frac{5}{2} R$.

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