Hello, Jaylin,
The question is difficult to read. I'll assume you want to balance two equations:
1. C3H8+O2⟶CO2+H2O
Start with the most difficult molecule. I'll choose C3H8. It contributes 3 carbons to the product side, so let's add a 3 in front of the CO2.
C3H8+O2⟶3CO2+H2O
It also contributes 8 hydrogens, so let's add a coefficient of 4 to the H2O.
C3H8+O2⟶3CO2+4H2O
The carbons and hydrogens now balance (same number on both sides). Now let's address the oxygens.
There are a total of 10 oxygens on the product side (6 from 2CO2, and 4 from 4H2O). Let's make the coefficient for O2 5, since that will provide all the oxygens we need.
Thus: C3H8+5O2⟶3CO2+4H2O is now a balanced equation.
- Use the same procedure for the second problem:
P4O10+H2O⟶H3PO4
- P: P4O10+H2O⟶4H3PO4 ---- 4 P on each side
- O: P4O10+6H2O⟶4H3PO4 ---- 16 O on each side
- H: P4O10+6H2O⟶4H3PO4 ---- 12 H on each side
P4O10+6H2O⟶4H3PO4 is balanced
Fun,
Bob