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05/10/2020 5:20 pm
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At a constant volume the specific heat of a gas is 0.075 and its molecular weight is 40. The gas is:
(a) Monoatomic
(b) Diatomic
(c) Triatomic
(d) None of the above
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05/10/2020 5:25 pm
(a) Monoatomic
Explanation:
We know that, Molar heat capacity at constant volume,
Cv = Specific heat at constant volume × Mol. wt.
= 0.075 × 40 = 3.0 cal
∵ Cp - Cv = R
or Cp = R + Cv = 2 + 3 = 5
Now, Cp /Cv = γ;
∴ γ = 5/3 = 1.66
This value shows that the gas is monoatomic.