Question

How many moles of `HCl` are in 75.0 mL of 0.200 M solution?

Answer 1

0.015 moles.

Explanation:

These questions can easily be resolved using the relationship that concentration (or molarity) m = no. of moles / no. of litres.

In this case, simply rearrange for no. of moles.

No. of moles = molarity x no. of litres = 0.2 x (75/1000) = 0.015 mol.