IIT JEE , AIEEE Forum - Physics , Thermal Physics

chirag

Q.:-

The mass of a gas molecule can be computed from the specific heat at constant volume C_v for argon is 0.075kcal/kg/K.. The molecular weight of an argon atom is.....

Direct answer like 40*10^-3 kg is not required...

Answer with full procedure is important....

Thanks....

dhavlu_aim_iit

do it in this manner.......
Cv = R/(gamma-1)....unit of R is per mole so for per kg we shld divide by molecular weight.....
Cv = r/M(gamma - 1)........so M = 2/(75*(2/3)) = 0.04

iitkgp_bipin

C_v = 0.075 kcal/(kg.K)

Suppose the molecular wt. = M

Then C_v = (75M) cal/(mol.K)

C_v = R/(

-1)

75M = 2/(5/3 - 1)

M = 0.04 kg

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