Essential Chemistry for IGCSE - Formulae And Equations (Section 1 - No. 42)
In the balanced equation: 2H2 + O2 -> 2H2O, what does the '2' in front of H2O represent?
The number of oxygen atoms
The number of hydrogen atoms
The number of water molecules
The total mass of water
Explanation
The coefficient '2' indicates that there are 2 molecules of water (H2O) produced.
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