# balance

1. ### tips for balance equations

(NH4)3 PO3 PO4 + Pb (NO3)4------>Pb3 (PO4)4 + NH4 NO3 Im helping my daughter (trying) To balance the above equation I call NH4(X) and PO4 (Y) and NO3 (Z) and I get 4, 3, ----> 1, and 12 respectively Am I doing this right? If I try with out substitution I get numbers everywhere...
2. ### Balance this equation?

I am a bit lost 3 C3H8(g) + 14 O2(g) → 8 CO2(g) + 12 H2O(g) + C(s)
3. ### Balance Redox reactions

Cr2O7^-2 + NO -> Cr^+3 +NO3^-1 identify two half reactions One of the steps i have problem is for Cr2 charge Cr2 +(-2)7 =-2 Cr2 = 12 so Cr = 6? and so how many electrons gained 12-3= 9 electrons or 6-3= 3 electrons Cr2O7^-2 -> Cr^+3 NO -> NO3^-1 Balance all elements except hydrogen and...
4. ### Equilibria and Mass Balance

Hi guys, I've been struggling with a fairly challenging (for me!) chemistry problem for about a week and a half now. I was hoping someone might be able to help me. Please let me know I what need to clarify, I am paraphrasing the problem here. I will try to state it as simply as I can without...