The following reaction shows the products when sulfuric acid and aluminum hydroxide react.

2al(oh)3 + 3h2so4 → al2(so4)3 + 6h2o

the table shows the calculated amounts of reactants and products when the reaction was conducted in a laboratory.

initial mass and yield sulfuric acid aluminum hydroxide
initial amount of reactant 40 g 45 g
theoretical yield of water from reactant 14.69 g 31.15 g

what is the approximate amount of the leftover reactant?

20.89 g of sulfuric acid
22.44 g of sulfuric acid
21.22 g of aluminum hydroxide
23.78 g of aluminum hydroxide