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Balance: Fe + H2O -> Fe3O4 + H2. Coefficient of H2O is
A1
B3
C2
D4
Answer & Solution
Correct answer: D. 4
1. The product Fe3O4 needs 3 Fe atoms on the left.
2. Its 4 oxygens come from 4 H2O molecules.
3. Those 4 H2O give 8 H, which become 4 H2 on the right.
4. So coefficient of H2O is 4.
_Source: Selina Concise Chemistry Class 9, Ch 4 The Language of Chemistry (Mistral OCR'd PDF), section on balancing equations_
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