Which set of coefficients would balance the following equation? Mg + AlCl₃ + Al + MgCl₂
1) 2Mg + AlCl₃ + Al + 2MgCl₂
2) 3Mg + 2AlCl₃ + 2Al + 3MgCl₂
3) Mg + 2AlCl₃ + 241 + MgCl₂
4) 3Mg + 4AlCl₃ + 4Al + 3MgCl₂