1.

46 gms of ethyl alcohol is dissolved in 18 gms of water. Calculate the mole fraction of ethyl alcohol, (at. wt of C = 12, O = 16, H = 1)

Answer»

Molecular mass of ethyl alcohol = 46 g

Mass of ethyl alcohol = 46 g

no. of moles of ethyl alcohol in sol. = \(\frac{46 g}{46 g}\) = 1 Molecular mass of H2O = 18 g

no. of moles of H2O in solution = \(\frac{18g}{18g}\) = 1 total 

no. of moles in solution = 1 + 1 = 2

Mole fraction of ethyl alcohol = \(\frac{1}{2}\) = 0.5



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