# 9 Transcribed Image Text: A student dissolves 14.5 g of potassium chloride (KCI)in 250. g of water in a well-insulated open cup. She then observes

9 Transcribed Image Text: A student dissolves 14.5 g of potassium chloride (KCI)in 250. g of water in a well-insulated open cup. She then observes the temperature of the water
fall from 21.0 °C to 16.3 °C over the course of 5.7 minutes.
KCI() — K (aq) + C (ag)
You can make any reasonable assumptions about the physical properties of the solutiaon. Be sure answers you calculate using measured data are
rounded to 2 significant digits.
Note for advanced students: It’s possible the student did not do the experiment carefully, and the values you calculate may not be the same as the
known and published values for this reaction.
O exothermic
O.P
Is this reaction exothermic, endothermic, or neither?
O endothermic
O neither
If you said the reaction was exothermic or endothermic, calculate the
amount of heat that was released or absorbed by the reaction in this case.
4.9 kJ
Calculate the reaction enthalpy AH per mole of KCI.
29.-
mol

(550 words)

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