(Answered) The reaction of magnesium with hydrochloric acid shown is

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The reaction of magnesium with hydrochloric acid shown is carried out and the gas is collected in a closed flask by bubbling it through water.

Mg(s) + 2HCl(aq) → MgCl₂ (aq) + H₂ (aq).

Assuming that the total pressure of gas in the flask is 742 mmHg, how many total moles of gas are present?

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