Question

In lab we sometimes use 0.10M HCl. How many moles of HCl would be in 500 mL of this solution?

Answer 1

0.05 mol HCl or n = 0.05 mol

Step-by-step explanation:

Molarity (M) is the number of moles within a volume of solution.

First we must convert mL to Liters by dividing by a factor of 1,000 as that is the conversion rate of mL to L. We convert from mL to L as that is the measurement we use in calculating pretty much anything else.

This leaves us with 0.5 L.

Since M = n/v we can rearrange the equation to n = M x v. So, n = 0.10 x 0.5.

We end up with the answer: 0.05 mol HCl