Balance Mg+HCl->MgCl2+H2 to answer coefficient questions

Mg_(s) + HCl_(aq) --> MgCl_2(s) + H_2(g)

_{which Hydrochloric Acid coefficient could be used to properly balance this equation?}

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Mg_(s) + HCl_(aq) --> MgCl_2(s) + H_2(g)

which Magnesium coefficient could be used to properly balance this equation?

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Mg_(s) + HCl_(aq) --> MgCl_2(s) + H_2(g)

which Magnesium Chloride coefficient could be used to properly balance this equation?

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Mg_(s) + HCl_(aq) --> MgCl_2(s) + H_2(g)

which Hydrogen gas coefficient could be used to properly balance this equation?

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Mg_(s) + HCl_(aq) --> MgCl_2(s) + H_2(g)

_{Balance this chemical reaction to determine}

How many atoms of hydrogen are involved in the properly balanced equation?

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