How many moles of HCL are in 20 ml sample of. 10 M HCL

0.002 moles

Explanation:

Concept tested: Molarity

We are given;

Volume of HCl as 20 ml or 0.02 L Molarity of HCl solution as 0.10 M

We are required to calculate the number of moles of HCl

What is molarity?

Molarity is the concentration of a solution in moles per liter

How is it calculated?

It calculated by dividing number of moles by volume; Molarity = Number of moles : Volume

To calculate the number of moles we rearrange the formula;

Moles = Molarity * Volume

In this case;

Moles of HCl = 0.10 M * 0.02 L

= 0.002 moles

Therefore, the number of moles of HCl is 0.002 moles