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If 2 litres hydrogen and 1 litre oxygen combine at same temperature pressure what is the ratio?

Answer and explanation

Correct answer: 2:1

The reaction is \(2H_2 + O_2 \rightarrow 2H_2O\). At the same temperature and pressure, reacting gas volumes are in the ratio of their coefficients. Therefore, hydrogen : oxygen is \(2:1\). The ratio \(1:2\) represents the reverse order. Exam tip: always follow the order of substances stated in the question when writing a ratio.

Related tags

Chemical CombinationGas Volume RatioGay-Lussac LawStoichiometryHydrogen OxygenLaws Of Chemical CombinationSome Basic Concepts Of ChemistryChemistry

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