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# I need help balancing a chemical equation?

I've been trying for a while and can't seem to get it down.

P4O10 + H2O = H3PO4

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- 6 years agoFavorite Answer
Since there are 4 Phosphorus atoms on the LHS, there should be 4 Phosphorus atoms on the RHS as well, so make the coeffecient of H3PO4 as 4

P4O10 + H2O = 4 H3PO4

Since there are 16 oxygen atoms on the RHS, there should be 16 Oxygen atoms on the LHS. However, there are already 11 atoms on LHS, make the coefficient of H2O as 6

P4O10 + 6 H2O = 4 H3PO4

There are 12 Hydrogen on LHS as well as RHS, so it is balanced. Phosphorus and Oxygen are balanced as well, so the equation is balanced

P4O10 + 6 H2O = 4 H3PO4

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