Question

Which of the following equations are correctly balanced?

I. 2 Li + O2 Li2O

II. MgCl2 Mg + Cl2

III. Ag + 2 HCl AgCl + H2

IV. 2 C3H6 + 9 O2 6 CO2 + 6 H2O

Answer 1

#2 is the only one correctly balanced. Hope I helped.

Answer 2

The coefficient of an element should both be the same for the reactant and product side.