Question detail
When converting calorimetry data into molar enthalpy changes, which unit is typically used for heat energy?
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. Joules
- B. Kilojoules
- C. Calories
- D. Watts
Answer
Joules
Explanation
In calorimetry, heat energy is typically measured in Joules. This unit is essential for calculating molar enthalpy changes, as it directly relates to the energy transferred during the reaction.
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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