What is the molality of LiCl in solution that is 9.0% by mass LiCl and has a density of 1.00 g/mL?
A)9.00
B)2.12
C)2.33
D)90.0
E)0.0900

Question

Quizplus · Accepted Answer

First, we need to convert the mass percent to molarity.

Assuming we have 100 g of solution: 
- 9.0 g is LiCl
- 91.0 g is water

We can calculate the moles of LiCl: 
moles LiCl = 9.0 g / 42.39 g/mol (molar mass of LiCl) = 0.2123 mol

Next, we need to calculate the mass of water (in kg) in the solution: 
mass water = 91.0 g = 0.091 kg

Now we can calculate the molality: 
molality = moles LiCl / mass of water (in kg) 
molality = 0.2123 mol / 0.091 kg = 2.33 mol/kg

Therefore, the answer is (C) 2.33.

What Is the Molality of LiCl in Solution That Is