Question detail
What is the molar enthalpy change if 1000 J of heat is released when 0.5 moles of a substance react (A-level cue dd56eff8 focus)
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. -500 J/mol (A-level cue dd56eff8 distractor 1)
- C. 2000 J/mol (A-level cue dd56eff8 distractor 2)
- D. 500 J/mol (A-level cue dd56eff8 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 version is uniquely anchored to Calorimetry and enthalpy measurements. Retrieval anchor: A-level cue dd56eff8. 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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