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The amount of oxygen in the reactants is 4 atoms. In the products, the oxygen is distributed to water (H2O) and O2 gas. Which coefficients would be placed in front of water and oxygen?

2 in front of water and 2 in front of oxygen
1 in front of water and 2 in front of oxygen
1 in front of water and 1 in front of oxygen
2 in front of water and 1 in front of oxygen

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Answered by GPT-5 mini AI
2 in front of water and 1 in front of oxygen.

Reason: water has 1 O and O2 has 2 O, so 2×1 + 1×2 = 4 oxygen atoms.