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Balancing Chemical Reactions

Which is correctly balanced?

A. H3PO4 + NaOH --> Na3PO4 + 3H2O
B. 2SO2 + O2 --> 2SO3
C. 2Na + 2H2O --> H2 + 2NaOH
D. CS2 + 2H2 --> 2H2S + CH4

Solution Preview

A. H3PO4 + NaOH --> Na3PO4 + 3H2O

This is not balanced. We place a 3 in front of the NaOH to balance the Na, O and H on both sides. Thus

H3PO4 + 3 NaOH --> Na3PO4 + 3H2O

B. 2SO2 + ...

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