What will be the $\Delta U$ value,when one mole of oxygen $(O_2)$ is heated from $-20^{\circ} C$ to $40^{\circ} C$ at constant volume (in $J$)? (Molar heat capacity for oxygen $\simeq 20.8 \ J \ mol^{-1} \ K^{-1}$)
- A$2496$
- B$20.8$
- C$416$
- D$1248$
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