A 23.0% by mass LiCl solution is prepared in water. What is the mole fraction of the water
A) 0.113
B) 0.127
C) 0.873
D) 0.887
E) 0.911

Question

Quizplus · Accepted Answer

The mole fraction of water in the solution can be calculated using the formula for mole fraction, which is the moles of solute divided by the total moles of solution. First, we need to calculate the moles of LiCl and water in a given mass of solution. Assuming we have 100 g of solution, 23.0 g would be LiCl and 77.0 g would be water. The molar mass of LiCl is approximately 42.39 g/mol, and the molar mass of water is 18.015 g/mol. Moles of LiCl = 23.0 g / 42.39 g/mol = 0.542 molesMoles of water = 77.0 g / 18.015 g/mol = 4.275 molesTotal moles = 0.542 moles + 4.275 moles = 4.817 molesMole fraction of water = moles of water / total moles = 4.275 / 4.817 = 0.887.

A 230% by Mass LiCl Solution Is Prepared in Water