Question

What is the molality if 734 mol of lithium sulfate are dissolved to make

2500 kg of solution.

a) 0.59
b) 0.29
c) 293.6
d) 29.4

Answer 1

0.29 M

Step-by-step explanation:

We are given;

• The number of moles of Lithium sulfate as 734 mol
• The mass of of Lithium sulfate solution as 2500 kg

We are needed to determine the molarity of lithium sulfate solution.

We need to know that;

Molarity of a solution = Moles of the solute ÷ Volume of the solution

Taking the density of the solution to be 1 000 kg/m³ or 1 g/cm³

Then;

Volume = Mass ÷ density

= 2500 kg ÷ 1000 kg/m³

= 2.5 m³

But, 1 m³ = 1000 L

Thus, volume = 2500 L

Therefore;

Molarity = 734 mol ÷ 2500 L

= 0.2936 mol/L

= 0.29 M

Therefore, the molarity of lithium sulfate solution is 0.29 M