Problem: The same reaction, with exactly the same amount of reactant, is conducted in a bomb calorimeter and in a coffee-cup calorimeter. In one of the calorimeters, qrxn = -12.5 kJ and in the other qrxn = -11.8 kJ. Which value was obtained in the bomb calorimeter? (Assume that the reaction has a positive ΔV in the coffee-cup calorimeter.)

🤓 Based on our data, we think this question is relevant for Professor Helquist's class at LUC.

FREE Expert Solution

Bomb calorimeter → constant volume:


qsol'n=q


Coffee cup calorimeter → constant pressure, but volume changes


qsol'n=q-PV

  • work done by reaction = -PΔV 


Therefore, qsoln from coffe cup calorimeter is lower than for bomb calorimeter

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Problem Details

The same reaction, with exactly the same amount of reactant, is conducted in a bomb calorimeter and in a coffee-cup calorimeter. In one of the calorimeters, qrxn = -12.5 kJ and in the other qrxn = -11.8 kJ. Which value was obtained in the bomb calorimeter? (Assume that the reaction has a positive ΔV in the coffee-cup calorimeter.)

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Based on our data, we think this problem is relevant for Professor Helquist's class at LUC.