Constant-Volume Calorimetry Video Lessons

Concept: Heat of Combustion

# Problem: In a calorimetry experiment a student determines the enthalpy for the reaction of magnesium with hydrochloric acid to be -430 kJ/mol. The true enthalpy for this reaction is -450 kJ/mol. Which of the following sources of error could account for this discrepancy?a. After recording the mass, some of the magnesium was dropped on the counterb. Some of the hot hydrogen gas escaped during the reaction.c. The calorimeter was not tightly shut for the experiment.d. The final temperature was recorded before the reaction was complete.e. All of these errors would cause a falsely high value for the enthalpy

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In a calorimetry experiment a student determines the enthalpy for the reaction of magnesium with hydrochloric acid to be -430 kJ/mol. The true enthalpy for this reaction is -450 kJ/mol. Which of the following sources of error could account for this discrepancy?

a. After recording the mass, some of the magnesium was dropped on the counter

b. Some of the hot hydrogen gas escaped during the reaction.

c. The calorimeter was not tightly shut for the experiment.

d. The final temperature was recorded before the reaction was complete.

e. All of these errors would cause a falsely high value for the enthalpy

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Constant-Volume Calorimetry concept. You can view video lessons to learn Constant-Volume Calorimetry. Or if you need more Constant-Volume Calorimetry practice, you can also practice Constant-Volume Calorimetry practice problems.

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