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Magnesium reacts with hydrochloric acid to form hydrogen gas according to the equation below. If sufficient hydrochloric acid is used to react completely with 72.9 g of magnesium, calculate how many moles of hydrogen gas (H2) will be produced. Use the stoichiometry road map to first convert the mass of Mg into moles of Mg

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samueladesida43

3 moles of hydrogen gas (H2) will be produced If sufficient hydrochloric acid is used to react completely with 72.9 g of magnesium.

  • The chemical reaction described in the question is represented in the following equation:

  • Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)

  • According to this equation, 1 mole of magnesium produces 1 mol of hydrogen gas.

  • First, we convert 72.9g of Mg to moles using the following formula:

  • moles of Mg = 72.9g ÷ 24.3g/mol

  • moles of Mg = 3 mol

  • If 1 mole of magnesium produces 1 mol of hydrogen gas. Therefore, 3 moles of Mg will produce 3 moles of hydrogen gas.

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