1.

10 g of an orgainc compound is dissolved per litre of the solution and gave an osmotic pressure of 1.18 atmosphere at 273 K. Calculate the molecular mass of compound.

Answer»


SOLUTION :`W_(B)=10g, V=1.0 L, pi=1.18" atm", T=273 K, R=0.0821" L atm K"^(-1)MOL^(-1), M_(B)=?`
`M_(B)=(W_(B)xxRxxT)/(pixxV)=((10g)xx(0.0821"L atm K"^(-1)mol^(-1))xx(273 K))/((1.18"atm")xx(1L))=189.94" g mol"^(-1)`.


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