Question detail
In the reaction between hydrogen and oxygen to form water, 2 moles of hydrogen react with 1 mole of oxygen. Calculate the volume of oxygen gas required to react with 4 moles of hydrogen at room temperature and pressure.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Use of amount of substance in relation to volumes of gases (chemistry only) (HT only)
Question
In the reaction between hydrogen and oxygen to form water, 2 moles of hydrogen react with 1 mole of oxygen. Calculate the volume of oxygen gas required to react with 4 moles of hydrogen at room temperature and pressure.
Answer
The answer is 12 dm3.
Explanation
This uses Gas Volume at Room Temperature and Pressure because the objective is about (chemistry only) (HT only) Calculate volumes of gaseous reactants and products from a balanced equation. The reasoning belongs to Gas volumes and amount of substance within Use of amount of substance in relation to volumes of gases (chemistry only) (HT only), so it should not be confused with nearby quantitative ideas such as mass, moles, concentration, yield, atom economy, or gas volume unless those are named in the objective. Use the focus term chemistry only to keep the answer aligned with AQA GCSE Chemistry 8462 Unit 4.3.
Common mistake
Misunderstanding Volume Calculation
Students often forget to use the correct mole ratios from the balanced equation when calculating the volumes of gaseous reactants and products.
Always refer to the coefficients in the balanced equation to determine the correct mole ratios before calculating the volumes.
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