the equation says that for every 2 moles of Al, you need 3 moles of H2SO4.
So, you will need 3/2 * 15 = 22.5 moles of H2SO4
Hydrogen gas can be produced by reacting aluminum with sulfuric acid. How many moles of sulfuric acid are needed to completely react with 15.0 mol of aluminum?
2Al(s) + 3H2SO4(aq) Al2(SO4)3(aq) + 3H2(g)
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