The specific heat at constant volume for the monoatomic argon is $0.075\, kcal/kg-K,$ whereas its gram molecular specific heat ${C_V}$ $= 2.98\, cal/mole/K.$ The mass of the argon atom is
$(Avogadro’s \,number = 6.02 \times {10^{23}}\,molecules/mole)$
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