Question detail
If 500 J of heat is absorbed by 0.25 moles of a substance, what is the molar enthalpy change?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Energetics
Question
- A. 2000 J/mol
- B. 1250 J/mol (A-level cue a9a5a409 distractor 1)
- C. 500 J/mol (A-level cue a9a5a409 distractor 2)
- D. 2500 J/mol (A-level cue a9a5a409 distractor 3)
Answer
2000 J/mol
Explanation
The correct option is 2000 J/mol. 2000 J/mol is correct because it supports the objective: Convert calorimetry data into molar enthalpy changes.. The reasoning stays within Calorimetry and enthalpy measurements and avoids drifting into a similar A-Level Chemistry idea. 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 Unit Conversion
Students often forget to convert the volume from cm³ to dm³ when calculating molar enthalpy changes using calorimetry data.
Always convert the volume to dm³ before using the formula for molar enthalpy change. For example, if the volume is 500 cm³, convert it to dm³ by dividing by 1000. Then use the formula: ΔH = q / n, where q is the heat energy transferred and n is the number of moles calculated from the mass and molar mass.
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