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 3.42 mol of magnesium?
Answer in units of g.

Okay. So first, I balanced the equation to Mg+2HCl -> MgCl2 + H2 and then idk what to do after that.

And then a follow up question is:
What mass of MgCl2 is produced. Answer in units of g.

Mg + 2 HCl → MgCl2 + H2

(3.42 mol Mg) x (2/1) x (36.4611 g HCl/mol) = 249 g HCl

(3.42 mol Mg) x (1/1) x (95.2115 g MgCl2/mol) = 326 g MgCl2