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

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

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Engineering Thermodynamics
An isolated system is one in which

Mass does not cross boundaries of the system, though energy may do so
Mass crosses the boundary but not the energy
Both energy and mass cross the boundaries of the system
Neither mass nor energy crosses the boundaries of the system

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