Question

Mole fraction of 100 grams C2H6O in 100 grams of water

Answer 1

X of C2H6O= mole of C2H6O/(mole of C2H6O+mole of H2O)

             = 100/46 / (100/46+100/18)

             = 100/46 / (1800+4600/(46x18))

             = 100/46 / (6400/828)

            = 100/46 x 828/6400

            = 18/64 = 9/32