# What is the molar mass of #Al_2(SO_4)_3#?

##### 1 Answer

#### Explanation:

The molar mass of

Start with

The atomic mass is

But there are two

Leave this number here for now. We will revisit this later.

Now we have to calculate for

Same thing! Add the atomic masses from the periodic table. Remember there are 4 oxygens per sulfur! Add all those and you should get an answer close to

Wait! There are three sulphates so multiply by 3. The answer should be

The question asks for the molar mass of the two ions I just calculated for. Simply add the two results for your answer :-)