When Mg reacts with HCl, it produces MgCl2 and H2(g). If 2.34 g of Mg react, how much MgCl2 is produced (in grams)?

Answer 1

Mg + 2HCl ==> MgCl2 + H2
mols Mg = grams/molar mass = ?
Using the coefficients n the balanced equation, convert mols Mg to mols MgCl2.
Now convert mols MgCl2 to grams. g = mols MgCl2 x molar mass Mgcl2.