Limiting Reactant Problems GUIDELINES FOR SOLVING LIMITING REAGENT PROBLEMS: 1.

Question

Limiting Reactant Problems GUIDELINES FOR SOLVING LIMITING REAGENT PROBLEMS: 1. Calculate the # of moles of product that can be made from each reactant Smallest amountamount of product formed! 2. Whichever reactant produces the smaller amount of product > limiting reagent 3. All other reactant (s)in excess Prob. 4: Consider the reaction between aluminum metal and hydrochloric acid to produce hydrogen gas: 2 Al (s) + 6 HCl (aq) -> 2 AlCl3 (aq) + 3 H2 (g) Calculate the number of moles of hydrogen gas produced whern 5.00 moles of aluminum metal reacts with 5.00 moles of HCI

Explanation / Answer

Moles of Al = 5 mol

Moles of HCl = 5 mol

From the stoichiometry of the reaction

2 moles of Al required = 6 moles of HCl

5 moles of Al required = 6*5/2 = 15 moles of HCl

But we have 5 moles of HCl which is less than required 15 moles of HCl.

HCl = limiting reactant

Al = excess reactant

Moles of H2 gas produced = 3 mol H2 x 5 mol HCl / 6 mol HCl

= 2.50 mol

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