The molar mass is also used to calculate the percent composition of an element. These two terms are explained here. Read the complete article for more information. Molar mass is the mass of one ...

When using chemical formula it is possible to calculate the percentage composition of the chemical. This can be useful when extracting metals from ores or when making fertilisers for specific plants.

Tenorite (Cu 2 O) is an ore of copper. Given that copper has a mass of 63.5 and oxygen a mass of 16, calculate the percentage by mass of copper in tenorite.