How many moles of aluminum ions are present in 0.34 moles of Al2(SO4)3?

Express the number of moles to two significant figures.

We need 0.68 moles of aluminium ions to be present to make 0.34 moles Al2(SO4)3

Explanation:

Step 1: Data given

Number of moles Al2(SO4)3 = 0.34 moles

Step 2: The balanced equation

2Al + 3H2SO4 = Al2(SO4)3 + 3H2

Step 3: Calculate the number of moles aluminium ions

For 2 moles we need 3 moles H2SO4 to produce 1 mol Al2(SO4)3 and 3 moles H2

For 0.34 moles Al2(SO4)3 we need 2*0.34 = 0.68 moles aluminium

We need 0.68 moles of aluminium ions to be present to make 0.34 moles Al2(SO4)3