A solution of LiCl in water is 20.0 wt% LiCl.What is the mole fraction of LiCl?
A)0)0960
B)0)106
C)0)472
D)4)44

Question

Quizplus · Accepted Answer

The mole fraction of LiCl is 0.0960. This can be calculated using the following formula:Mole fraction of LiCl = (moles of LiCl) / (total moles of solution)The moles of LiCl can be calculated by dividing the mass of LiCl by its molar mass. The total moles of solution can be calculated by dividing the mass of the solution by the molar mass of water.In this case, the mass of LiCl is 20.0 g and the mass of the solution is 100.0 g. The molar mass of LiCl is 42.39 g/mol and the molar mass of water is 18.02 g/mol.Therefore, the moles of LiCl is 20.0 g / 42.39 g/mol = 0.472 mol. The total moles of solution is 100.0 g / 18.02 g/mol = 5.55 mol.Therefore, the mole fraction of LiCl is 0.472 mol / 5.55 mol = 0.0960.

A Solution of LiCl in Water Is 20