Engineering Thermodynamics
The value of the product of molecular weight and the gas characteristic constant for all the gases in M.K.S. unit is

29.27 kgfm/mol °K
8314 kgfm/mol °K
848 kgfm/mol °K
427 kgfm/mol °K

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Engineering Thermodynamics
Gases have

Under some conditions one value and sometimes two values of specific heat
No value of specific heat
Two values of specific heat
Only one value of specific heat

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