If magnesium reacts with hydrochloric acid to produce hydrogen gas and magnesium

Question

If magnesium reacts with hydrochloric acid to produce hydrogen gas and magnesium chloride, how many grams of magnesium must react to produce 3.2 grams of hydrogen? Mg + 2HCl rightarrow MgCl_2 + H_2 Potassium chlorate decomposes when heated to produce potassium chloride oxygen gas. What is the theoretical yield of oxygen in grams it 12 g of the chlorate decomposes in this manner? 2KClO_3 rightarrow 2KCl + 3O_2 How many grams of oxygen would be produced if 6.5 g of potassium chlorate is decomposed into oxygen and potassium chloride by heating? 2KClO_3 rightarrow 3O_2 = 2KCl

Explanation / Answer

Given reaction is

Mg + 2 HCl ---> MgCl2 + H2

1 mole 2 mole 1 mole 1mole

given 3.2 g of hydrogen will be produced

Molar mass of H2 = 2 g/mol

No. of moles of H2 = Mass / Molar mass = 3.2 g / 2 g/mol = 1.6 moles

from the reaction stoichometry 1 mole of Mg will produce 1 mol of H2

so 1.6 moles of H2 to be produced 1.6 moles of Mg should react

Molar mass of Mg = 24.3 g/mol

Mass of Mg = 1.6 moles * 24.3 g/mol = 38.8 g Answer

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