At constant volume,


At constant volume, $4 \mathrm{~mol}$ of an ideal gas when heated from $300 \mathrm{~K}$ to $500 \mathrm{~K}$ changes its internal energy by $5000 \mathrm{~J}$. The molar heat capacity at constant volume is __________________ .


$(6.25) \quad \Delta U=n C_{v} \Delta T$

$5000=4 \times C_{v}(500-300)$

$\mathrm{C}_{\mathrm{v}}=6.25 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$

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