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eng-fall07-q8059x06b

# eng-fall07-q8059x06b - A system absorbs 85 kJ of heat from...

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CHEM 2045C: Quiz 6 (10/19/07) NAME ___________________________ N #_____________ Show your work for full credit Eng Q8059x06b Continued on the back Potentially helpful information 1 in = 2.54 cm (exactly) 1 lb = 453.59 g 1 L = 1.0567 qt 1 amu = 1.66053873 × 10 -24 g e = 1.60217653×10 -19 C ° C = 5 / 9 ( F – 32) K = C + 273.15 Avogadro’s # = 6.0221421×10 23 1 J = 1 kg·m 2 /s 2 1 cal = 4.184 J (exactly) As always, show your work, follow significant figure rules and box your answers for full credit. 1. (2 pts) The heat content of a substance at constant pressure is called ___________________________ and is given the symbol ____________. 2. (1 pt) Which of the following are state functions? I. the volume of a balloon II. enthalpy III. the temperature of water in a coffee cup [a] I only [b] II only [c] III only [d] two of these [e] all of these [f] none of these 3. (2 pts) When is the change in enthalpy equal to the change in internal energy? 4. (3 pts)

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Unformatted text preview: A system absorbs 85 kJ of heat from its surroundings while doing 29 kJ of work on the surroundings. Calculate the change in internal energy of the system and determine whether the process is endothermic or exothermic. CHEM 2045C: Quiz 6 Eng Q8059x06b Show your work for full credit THE END 5. (1 pt) What is the specific heat of water (in J/g·ºC)? 6. (3 pts) The specific heat of iron is 0.450 J/g·ºC. How many joules of heat are necessary to raise the temperature of a 1050 g block from 25.0 ºC to 88.5 ºC? 7. (3 pts) A 2.56 g sample of sulfur is burned in a bomb calorimeter. q bomb = +5050 J and q water = +18700 J. i. What is the heat of the reaction PER GRAM of sulfur? ii. Is pressure or volume constant during a bomb calorimetry experiment? Bonus. (2 pts) While preparing this quiz, Dr. Eng drank a soda which contained 1.50 × 10 2 (nutritional) Calories. How many (scientific) calories, and how many joules did he drink?...
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eng-fall07-q8059x06b - A system absorbs 85 kJ of heat from...

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