Question

What are the coefficients that will balance the following chemical equation?

____Mg + ______HCl →_____ MgCl2 + _____H2


1,1,1,1


1,2,1,1


2,2,2,2


1,2,1,2

Answer 1

1, 2, 1, 1

Explanation: Mg + 2 HCl → MgCl2 + H2 balances atoms (Mg:1, Cl:2, H:2).