Magnesium metal (0.100 mol) and a volume of aqueous hydrochloric acid that contains 0.500 mol of HCl are combined and react to completion. How many liters of hydrogen gas, measured at STP, are produced? Mg(s) + 2HCl(aq) $\to$ MgCl₂(aq) + H₂(g)

Question

Quizplus · Accepted Answer

The balanced chemical equation shows that 1 mol of Mg reacts with 2 mol of HCl to produce 1 mol of H2. Therefore, 0.100 mol of Mg will react with 0.200 mol of HCl to produce 0.100 mol of H2. At STP, 1 mol of any gas occupies 22.4 L. Therefore, 0.100 mol of H2 will occupy 0.100 mol * 22.4 L/mol = 2.24 L.

Magnesium Metal (0 →\to→ MgCl2(aq) + H2(g) A) 2

Magnesium Metal (0 $\to$ MgCl₂(aq) + H₂(g)
A) 2