If ${C_p}$ and ${C_v}$ denote the specific heats of nitrogen per unit mass at constant pressure and constant volume respectively, then

Question

${C_p} - {C_v} = 28R$

${C_p} - {C_v} = R/28$

${C_p} - {C_v} = R/14$

${C_p} - {C_v} = R$

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