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QUESTION

# What is the molar mass of aluminum sulfate?

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

Aluminium sulfate is an 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")