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
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