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Q 1. a. A process in which heat is given off is said to be _____________________...

Q 1.

a. A process in which heat is given off is said to be _____________________ (endothermic or exothermic)

b. DH is negative for an ___________________ (endothermic or exothermic) reaction

c. If a reaction is carried out in solution, and the solution gets cooler as the reaction occurrs, the reaction must be ___________________ (endothermic or exothermic)

d. A hot penny is dropped in water, and 25.2 J is tranferred from the penny to the water. q for the water = _____________ and q for the penny = ______________

e. A 2.00-g sample of a salt is dissolved in 30.0 g of distilled water in a calorimeter. The temperature of the solution rises from 20.5 ºC to an extrapolated final temperature of 31.7 ºC. Assume that the mass of the solution is the combined masses of the salt and the water and that the specific heat capacity of the solution is 4.18 J/g.ºC.

f) Calculate the heat of dissolution, qrxn in Joules. Clearly show ALL your calculations.

g) Calculate the enthalpy change of dissolution of this salt (M.M. = 121 g/mol) in kJ/g and in kJ/mol. Clearly show ALL your calculations.

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