# What is the molarity of 400 g of CuSO_4 in 4.00 L of solution?

Aug 18, 2016

0.627 M

#### Explanation:

The molecular weight of $C u S {O}_{\text{4}}$ is 159.609 g/mol, so 1 mole of $C u S {O}_{\text{4}}$ weighs 159.609 g.

You have 400 g of $C u S {O}_{\text{4}}$, hence you have:

$\text{400 g" / "159.609 g/mol" = 2.5061243 " moles}$

This 2.5061243 moles is in 4 liters.

Molarity is moles per liter, so:

$\text{2.5061243 moles" / "4 liters" = 0.627 " Molar}$