The example below will show you how to complete this. 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 ...

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.

The International Olympic Committee (IOC) announced the composition of the IOC commissions for 2017, marked by an increase of 70 per cent in female participation since September 2013. The ...