Question #8ede8

1 Answer
Jun 29, 2015

Answer:

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-)#.

http://www.coleparmer.com/Product/Aluminum_sulfate_99_999_5g/EW-88205-71

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")#