Question detail
If 48 dm3 of a gas is produced at room temperature and pressure, how many moles of the gas are present?
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
If 48 dm3 of a gas is produced at room temperature and pressure, how many moles of the gas are present?
Answer
The answer is 2 dm3.
Explanation
This uses Gas Volume at Room Temperature and Pressure because the objective is about (chemistry only) (HT only) Use ratios, fractions and percentages in gas-volume calculations. (MS 1c). 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 Ratios in Gas-Volume Calculations
Students often confuse the ratios of gases in a balanced equation, leading to incorrect volume calculations.
Carefully analyze the coefficients in the balanced equation to determine the correct mole ratios before calculating the volumes.
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