To determine the limiting reactant, we need to compare the number of moles of each reactant to the stoichiometric coefficients in the balanced equation.
The balanced equation tells us that 2 moles of Li react with 1 mole of H2SO4. Therefore, if we have 3 moles of Li and 3 moles of H2SO4, we can see that we have an excess of H2SO4 because we only need 1.5 moles of H2SO4 to react with all 3 moles of Li.
So the limiting reactant is Li because it will run out first. We have 1.5 moles of H2SO4 left over after the reaction is complete.
Therefore, the correct answer is:
Li because you will run out of Li first.