It is generally assumed that a coffee-cup calorimeter does not absorb any heat w

Question

It is generally assumed that a coffee-cup calorimeter does not absorb any heat when used to measure heat transfers during a calorimetric measurement. Suppose the previous assumption no longer holds for the Q-Max calorimeter that Martin is using to study an exothermic reaction in the laboratory If Martin does not apply any correction to the enthalpy he finds in the Q-Max calorimeter, how will the magnitude AHI be different from its actual (intended) value? higher because IATI would be lower higher than its actual value lower than its actual value remain the same because IATI would be higher remain the same because energy is conserved (A) C

Explanation / Answer

Coffee-cup calorimeter

If Martin does not apply any correction to the enthalpy he finds in the Q-max calorimeter, the magnitude dH be different from its actual value,

(C) lower than its actual value

The final temperature would be lower as some of the heat generated will be absorbed by the calorimeter. Since the correction is not done for this, the dH would turn out to be lower due to low dT value for the system.

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