A solution of LiCl in water is 22.0 wt% LiCl.What is the mole fraction of LiCl?
A)0.107
B)0.120
C)0.519
D)4.33

Question

Quizplus · Accepted Answer

The mole fraction of LiCl can be calculated by first determining the moles of LiCl and water in the solution. Given that the solution is 22.0 wt% LiCl, this means there are 22 grams of LiCl in 100 grams of solution. Therefore, there are 78 grams of water (since 100 - 22 = 78 grams of water).The molar mass of LiCl is approximately 42.39 g/mol (Li ~ 6.94 + Cl ~ 35.45), and the molar mass of water (H2O) is approximately 18.015 g/mol.Moles of LiCl = 22 g / 42.39 g/mol = 0.519 molesMoles of water = 78 g / 18.015 g/mol = 4.33 molesThe total moles in the solution = moles of LiCl + moles of water = 0.519 + 4.33 = 4.849 molesThe mole fraction of LiCl (χ_LiCl) is calculated as the moles of LiCl divided by the total moles in the solution:χ_LiCl = 0.519 moles / 4.849 moles = 0.107Therefore, the mole fraction of LiCl is 0.107.

A Solution of LiCl in Water Is 22