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Practice Worksheet WITH answers

# Practice Worksheet WITH answers - Practice Worksheet...

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Practice Worksheet Chapters 10-11 Possibly Useful Information: Ideal Gas Constant: R = 8.315 J/mol·K Boltzmann’s Constant: k = 1.38 x 10 -23 J/K Avogadro’s Number: N A = 6.02 x 10 23 mol -1 Specific Heat (Aluminum): c = 900 J/kg·K Specific Heat (Iron): c = 450 J/kg·K Specific Heat (Ice): c = 2100 J/kg·K Specific Heat (Water): c = 4186 J/kg·K Specific Heat (Steam): c = 2010 J/kg·K Heat of Fusion (Water): L = 3.33 x 10 5 J/kg Heat of Vaporization (Water): L = 2.26 x 10 6 J/kg An ideal gas is placed in a container whose volume can be changed. Initially the gas has a volume of 3.00 m 3 , a temperature of 273 K, and a pressure of 1.013 x 10 5 N/m 2 . 1) What is the average kinetic energy of the gas molecules in the container? Answer: 5.65 x 10 -21 J 2) An oxygen atom has a mass m = 2.65 x 10 -26 kg. If the gas is composed of monatomic oxygen, what is the average speed of the oxygen atoms in the gas? Answer: 6.53 x 10 2 m/s 3) A xenon atom has a mass m = 2.18 x 10 -25 kg. If the gas is composed of monatomic xenon, what is the average speed of the xenon atoms in the gas? Answer: 2.28 x 10 2 m/s 4) How many gas atoms are in the container? Answer: 8.06 x 10 25 atoms An aluminum cup with a mass of 0.100-kg contains 0.250 kg of glycerin. Both the cup and its contents have an initial temperature of 10°C. A 0.290-kg piece of iron at 180°C is placed in the cup. Eventually, the aluminum cup, the glycerin, and the iron all have a temperature of 38°C 5) How much heat leaves the iron? Answer: 1.85 x 10 4 J 6) How much heat enters the aluminum? Answer: 2.52 x 10 3 J 7) How much heat enters the glycerin? Answer: 1.60 x 10 4 J 8) What is the specific heat of glycerin? Answer: 2.29 x 10 3 J/kg·K A 10-gram ice cube has been in a freezer at a temperature of -8.5°C for a long time. It is then removed from the freezer and placed in a 100-g aluminum cup containing an unknown amount of water. The cup and the water have an initial temperature of 20°C. Eventually, the cup contains nothing but water, and everything is at a temperature of 16°C. 9) How much heat did the ice cube gain as it warmed to its melting temperature? Answer: 1.79 x 10 2 J 10) How much heat did the ice cube gain as it melted? Answer: 3.33 x 10 3 J 11) How much heat did the melted water gain as it warmed to its final temperature?

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