Please help!!

Question

How to balance? (note: Chloride ion is a monatomic ion use only Cl^-)
1. NaCl
2. CaCl
3. AlCl

Answer 1

1. Is balanced as is.
2. Calcium has a 2+ charge. so the balanced molecule will be CaCl₂.
3. Aluminum has a 3+ charge so the balanced molecule will be AlCl₃.