# Question 87747

Sep 30, 2016

30.89 × 10^"23" atoms

#### Explanation:

The fact that it is Ca is irrelevant.

One mole of a substance 1 mole contains 6.022140857 × 10^"23" atoms, ions or molecules. This is Avogadro's number and is defined as the number of atoms in 12 g of carbon-12.

Som 5.13 moles of Ca would contain:

5.13 × 6.022140857 × 10^"23" = 30.89 × 10^"23"# atoms.