What is the mole fraction of ethanol and water respectively in a sample of rectified spirit which contains 95 % of ehtanol by weight ?

Answer

Ethanol = 0.88, water =0.12

Explanation

If 100 g is the total mass ,
Mass of ethanol ` = 95 g`
Moles of water ` = (95)/(46) = 2.065`
Moles of water ` = (5)/(18) =0.278`
Mole fraction of ethanol ` = (2.065)/(2.065+0.278) = 0.88`
Mole fraction of water `= (0.278)/(2.065+0.278) = 0.12`