Question

Calculate the molarity molality and mole fraction of ethyl alcohol in a solution of total volume 95 ml prepared by adding 50 ml of ethyl alcohol (density 0.789 g/ml) to 50 ml water (density 1.00g/ml)

Answer 1

moles of ethyl alcohol=50*.789/48 = 0.821875
moles of water = 45*1/18 = 2.5
 
mole fraction = 0.822/3.322=0.25

molarity = 0.822/.095= 8.65 M

molality =0.822/(45*1)= 0.1644 m