Molar specific heat of oxygen at constant pressure ${C_p} = 7.2\,cal/mol^\circ C$ and $R = 8.3 joule/mol/K$. At constant volume, $5\, mol$ of oxygen is heated from $10°C$ to $20°C$, the quantity of heat required is approximately ........ $cal$
A$25$
B$50$
C$250$
D$500$
Medium
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C$250$
c Molar heat capacity at constant volume, $C _{ v }= C _{ p }- R$ $=5 \; cal / molK$
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