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Question #8ede8

1 Answer

Jun 29, 2015

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

Explanation:

Aluminium sulfate is an ionic compound with the formula $A l_{2} {(S O_{4})}_{3}$ $Al_2(SO_4)_3$ .

It is formed when 2 aluminium cations, $A l^{3 +}$ $Al^(3+)$ , bond to 3 sulfate anions, $S O_{4}^{2 -}$ $SO_4^(2-)$ .

![http://www.coleparmer.com/Product/Aluminum_sulfate_99_999_5g/EW-88205-71]( useruploads.socratic.org )

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 - $2 \cdot 27.0 g/mol$ $2 * "27.0 g/mol"$
three atom of sulfur - $3 \cdot 32.07 g/mol$ $3 * "32.07 g/mol"$
twelve atoms of oxygen - $12 \cdot 16.0 g/mol$ $12 * "16.0 g/mol"$

The molar mass of the compound will thus be

$M_{M} = 342.2 g/mol$ $M_M = color(green)("342.2 g/mol")$

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