Question

A 293.9 mL sample of a 0.275 M solution is left on a hot plate overnight; the following morning the solution is 1.10 M. What volume of solvent in mL has evaporated from the 0.275 M solution

Answer 1

220.4mL were evaporated

Step-by-step explanation:

First, we are going to calculate the moles of the solution. Then, with the new concentration we can solve the volume of the solution and the evaporated volume:

Moles initial solution:

293.9mL = 0.2939L * (0.275mol / L) = 0.08082 moles of solution.

As the new concentration is 1.10M, the new volume must be:

0.08082 moles of solution * (1L / 1.10mol) = 0.07348L =

73.5mL you have still present in you solution

And evaporated volume is:

293.9mL - 73.5mL =

220.4mL were evaporated