Here are the answers for the suggested homework on balancing equations.

1. For problem #1, here are the coefficients, in order for each of the complete equations:

• 1,3,1,3
• 2,12,5,9
• 2,2,2,3
• 2,3,1,6
• 3,2,1,6
• 3,2,1,3 [products are aluminum dichromate and barium nitrate; Al₂(Cr₂O₇)₃ and Ba(NO₃)₂]
• 1,12,10,4 [products are carbon dioxide and water; CO₂ and H₂O]

2. 2 HClO₄ = H₂O + Cl₂O₇ [the equal sign should be an arrow]
3. MgCl₂ + 2 HNO₃ = Mg(NO₃)₂ + 2 HCl [the equal sign should be an arrow]