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Derive the relation between Density and ...

Derive the relation between Density and Molar mass of a gaseous substance from ideal gas equation.

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WKT PV= nRT is ideal gas equation rerranging `n=(PV)/(RT)` [ but `N=("mass")/("molecular mass")=(m)/(M)]`
`:. (m)/(M)=(PV)/(RT)`
`(m)/(V)*(1)/(M)=(P)/(RT)` [ but `(m)/(v)` density (d)]
`(d)/(M)=(P)/(RT)`
`:. M=(dRT)/(P)`
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