Chemistry · Oct / Nov 2025 · Paper 12 · Question 9

A mixture of 2 g of hydrogen and 32 g of oxygen occupies a volume, V, measured at r.t.p. The gases react until there is no further change. 2H2(g) + O2(g) → 2H2O(l) Which reactant is in excess and what is the final volume of the mixture measured at r.t.p.?

1. Ahydrogen, V/4
2. Bhydrogen, V/2
3. Coxygen, V/4
4. Doxygen, V/2

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