The value of the gas constant $(R)$ calculated from the perfect gas equation is $8.32\, joules/gm \,mole\, K,$ whereas its value calculated from the knowledge of ${C_P}$ and ${C_V}$ of the gas is $1.98\, cal/gm\, mole\, K.$ From this data, the value of $J$ is ......... $J/cal$
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