Consider the balanced equation. 2HCl + Mg MgCl2 + H2 If 40.0 g of HCl react with an excess of magnesium metal, what is the theoretical yield of hydrogen?

Theoretical yield of hydrogen is 1.11 g

Explanation:

Balanced equation,

As Mg remain present in excess therefore HCl is the limiting reagent.

According to balanced equation, 2 moles of HCl produce 1 mol of .

Molar mass of HCl = 36.46 g/mol

So, 40.0 g of HCl = of HCl = 1.10 moles of HCl

Hence, theoretically, number of moles of are produced from 1.10 moles of HCl =

Molar mass of = 2.016 g/mol

So, theoretical yield of =