The molar enthalpy of solution of a salt that dissolves endothermically in water is measured in a co — Laboratory Chemistry Chemistry Question
Question
The molar enthalpy of solution of a salt that dissolves endothermically in water is measured in a coffee-cup calorimeter by weighing a known amount of distilled water into the cup and measuring its temperature, then adding a known mass of the salt to the water and measuring the temperature after the salt dissolves. If some water is initially present in the cup before the weighed amount of water is added, what is the effect on the experiment?
A.
Calculated ∆H°soln > True ∆H°soln
B.
Calculated ∆H°soln = True ∆H°soln
C.✓ Correct
Calculated ∆H°soln < True ∆H°soln
D.
The reaction will be calculated to be exothermic even though it is actually endothermic.
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