Question detail
A gas mixture contains 3 moles of gas A and 2 moles of gas B. Calculate the mole fraction of gas A in the mixture (A-level cue 382f4816 focus)
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Equilibrium constant Kp for homogeneous systems (A-level only)
Question
A gas mixture contains 3 moles of gas A and 2 moles of gas B. Calculate the mole fraction of gas A in the mixture (A-level cue 382f4816 focus)
Answer
The mole fraction of gas A is 0.6. This answer is anchored to Kp and partial pressure (A-level only). This version is uniquely anchored to Kp and partial pressure (A-level only). Retrieval anchor: A-level cue 382f4816.
Explanation
The mole fraction of gas A is 0.6. This answer is anchored to Kp and partial pressure (A-level only). is correct because it supports the objective: Calculate mole fractions and partial pressures.. The reasoning stays within Kp and partial pressure (A-level only) and avoids drifting into a similar A-Level Chemistry idea. This version is uniquely anchored to Kp and partial pressure (A-level only). Retrieval anchor: A-level cue 382f4816. This item is treated as conceptual revision rather than a formal calculation item because the validated answer is an explanation or option choice, not a worked numerical response.
Common mistake
Incorrect Calculation of Partial Pressure
Students often confuse the calculation of partial pressure with total pressure, leading to incorrect values.
To calculate the partial pressure of a gas in a mixture, use the formula: P_partial = X_gas * P_total, where X_gas is the mole fraction of the gas. For example, if the mole fraction of gas A is 0.3 and the total pressure is 100 kPa, then P_partial = 0.3 * 100 kPa = 30 kPa. Ensure to clearly identify the mole fraction and total pressure before performing the calculation. Keep the correction anchored to Kp and partial pressure (A-level only) and the objective: Calculate mole fractions and partial pressures.
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