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CHAPTER 6 MAKE UP HOMEWORK

# CHAPTER 6 MAKE UP HOMEWORK - CHAPTER 6 MAKE UP HOMEWORK 1...

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CHAPTER 6 MAKE UP HOMEWORK 1. The gas in a piston (defined as the system) is warmed and absorbs 655 J of heat. The expansion performs 344 J of work on the surroundings. What is the change in internal energy for the system? 2. Suppose that 25 g of each of the following substances is initially at 27.0 o C. What is the final temperature of each substance upon absorbing 2.35 kJ of heat? a. mercury (s = 0.14 J/ o C*g) b. iron (s = 0.45 J/ o C*g) c. aluminum (s = 0.89 J/ o C*g) c. water (s = 4.18 J/ o C*g) 3. Determine whether each of the following is exothermic or endothermic and indicate the sign of ΔH. a. dry ice evaporating b. a sparkler burning c. water condensing from steam 4. Consider the following thermochemical equation for the combustion of acetone (C 3 H 6 O), the main ingredient in nail polish remover: C 3 H 6 O (l) + 4 O 2 (g) 3 CO 2 (g) + 3 H 2 O (g) ΔH = -1790 kJ. If a bottle of nail polish remover contains 177 mL of actone, how much heat would be released by its complete combustion? The density of acetone is 0.788 g/mL.

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