Answer to Question #141605 in General Chemistry for Javier

Question

Magnesium reacts with HCl to produce MgCl2 and hydrogen gas.

How many liters of a 1.85 M HCl solution completely react with 4.00 grams of magnesium?

Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g)

Answer 1

1 mole of Mg reacts with 2 moles of HCl

24g of Mg reacts with 2 moles of HCl

1g of Mg will react with 2/24 moles of HCl

4g of Mg will react with 2/24 × 4 moles of HCl

= 0.33mole of HCl

Concentration of HCl = mole/volume

Volume = mole / concentration = 0.33/1.85 = 0.175L