CHM121_PRACTICE-EXAM-3

# CHM121_PRACTICE-EXAM-3 - Edison NJ 08818 CHM121:Summer2010...

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Middlesex County College Edison, NJ 08818 CHM 121: Summer  2010 Name: Practice Exam  3 Answer all questions. Express your answer in correct significant figures  with proper scientific notation wherever applicable. 1.. What is the change in internal energy (in J ) of a system that releases 7.5 kJ of heat to the surroundings and the volume increases from 20.0 L to 25.0 L at a constant pressure of 1.5 atm. (1 L. atm = 101.316 J) 2. Calculate the final temperature when 25.0 g of water at 80 ° C is added to 15.0 g of water at 25 ° C. Assume no heat is lost to the surroundings and the specific heat of water is 4.184 J/(g. ° C). 3. Calculate the mass in grams of ethylene glycol required to bring down the temperature in a car radiator from 37 ° C to 25 ° C , if 2.20x10 5 J of heat is released in the process. (specific heat of ethylene glycol is 2.42 J/(g. ° C). 4.a. Calculate the number of photons of microwave radiation of wavelength 15.0 cm required to raise the temperature of 600.0 g of water from 40.0 ° C to 75 ° C. The specific heat of water is 4.184J/(g. ° C).

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b. A common laboratory reaction is the neutralization of an acid with a base.
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CHM121_PRACTICE-EXAM-3 - Edison NJ 08818 CHM121:Summer2010...

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