Problem 27P

A pure gold coin contains 0.145 mol of gold. What is its mass?

Solution 27P

Given : Pure gold contains 0.145 mol of gold

Mass of gold = ?

Molar mass of gold (Au) = 196.96 g/mol.

This means, 1 mole of gold = 196.96 g of gold.

Hence, becomes the conversion factor.

Now to find the mass of Au we multiply the given mol of Au with the conversion factor.

= 28.552 g

Hence, mass of gold is 28.552 g