The specific heat of hydrogen gas at constant pressure is ${C_P} = 3.4 \times {10^3}cal/kg{\,^o}C$ and at constant volume is ${C_V} = 2.4 \times {10^3}cal/kg{\,^o}C.$If one kilogram hydrogen gas is heated from ${10^o}C$ to ${20^o}C$ at constant pressure, the external work done on the gas to maintain it at constant pressure is
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