Past Midterm - Previous Midterm Questions These questions...

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Previous Midterm Questions These questions were taken from previous midterm examinations from CHEM 120, which may be of assistance to you in studying. Please remember however that the course, and instructors, change from year to year, so many of these questions will not be as relevant to this year’s CHEM 120 as some. This gives the impression of being more difficult than they were when given, since different homework was assigned, and more time may have been spent in class in some of these topics. Some terminology and variables may have changed somewhat too. Good luck studying. Solutions are also posted to WEB CT. 1. What is the work in joules done on the system to compress He gas from 24.0 L to 12.5 L against a pressure of 1.5 atm at a constant temperature of 37.4 ºC ? 2. 246 g of hot coffee at 86.0 ºC are placed in a 137 g mug at 20.0 ºC. The specific heat of coffee is 4.00 J/g ºC, while that of the mug is 0.752 J/g ºC. Assuming that no heat is lost to the surroundings, what is the final temperature of the system: mug + coffee? a. 79.7 ºC b. 93.7 ºC c. 98.4 ºC d. 76.0 ºC e. 53.0 ºC
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