What is the Molar Ratio for Dissolving Aluminum with Sulfuric Acid?

[MorQQ]

Homework Statement

sulfuric acid dissolves aluminum metal according to
2 Al(s) + 3 H2SO4 ---- Al2(SO4)3 (aq) + 3 H2

find minimum mass of H2SO4 in g if you wanted to dissolved aluminum block with mass of 15.2 g

Homework Equations

see above

The Attempt at a Solution

15.2 g Al x 1/26.98g x I am confused about molar ratios what do i use? x 98.09 g H2So4

could someone help me with molar ratios i don't understand what to multiply by

 

[Borek]

Look at the reaction equation - how many moles of acid needed for 2 moles of aluminum?