One reaction that produces hydrogen gas can be represented by the unbalanced chemical
equation
Mg(s) + HCl(aq) −→ MgCl2(aq) + H2(g).
What mass of HCl is consumed by the reaction of 3.15 mol of magnesium?
Answer in units of g.

the volume increases

you did not give any options thus this is the best answer i can give to you with this little information you have given

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