Calculate the specific heat capacity at constant volume for a gas. Given specific heat capacity at constant pressure is `6.85 cal mol^(-1) K^(-1), R = 8.31 J mol^(-1)K^(-1)`.
`J - 4.18 J cal^(-1)`.

Explanation

To calculate the specific heat capacity at constant volume (Cv) for a gas, we can use the relationship between the specific heat capacities at constant pressure (Cp) and constant volume (Cv), which is given by the equation:

\[ Cp - Cv = R \]

Where:
- \( Cp \) is the specific heat capacity at constant pressure,
- \( Cv \) is the specific heat capacity at constant volume,
- \( R \) is the universal gas constant.
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