Answer to Question #350671 in Chemistry for Cow

Question

1. Hydrogen gas can be produced through the following reaction

Mg + 2HCI - MgCl2 + H,

a. How many grams of HC|(hydrochloric acid) are used by the reaction of 3.50

moles of Mg (magnesium)?

Answer 1

Solution:

Balanced chemical equation:

Mg + 2HCI → MgCl₂ + H₂

According to stoichiometry:

1 mol of Mg reacts with 2 mol of HCl

Thus, 3.50 mol of Mg react with:

(3.50 mol Mg) × (2 mol HCl / 1 mol Mg) = 7.00 mol HCl

The molar mass of HCl is 36.5 g/mol

Therefore,

Mass of HCl = (7.00 mol HCl) × (36.5 g HCl / 1 mol HCl) = 255.5 g HCl

Answer: 255.5 grams of hydrochloric acid (HC) are used by the reaction