Question

Question #8ede8

Answer 1

The molar mass of aluminium sulfate is 342.2 g/mol.

Explanation:

Aluminium sulfate is an ionic compound with the formula `Al_2(SO_4)_3`.

It is formed when 2 aluminium cations, `Al^(3+)`, bond to 3 sulfate anions, `SO_4^(2-)`.

To get the molar mass of the compound you need to add the molar masses of all the atoms that form the aluminium sulfate formula unit.

This means that you have

• two atoms of aluminium - `2 * "27.0 g/mol"`
• three atom of sulfur - `3 * "32.07 g/mol"`
• twelve atoms of oxygen - `12 * "16.0 g/mol"`

The molar mass of the compound will thus be

`M_M = color(green)("342.2 g/mol")`