Quiz1 Solutions

# Quiz1 Solutions - Name Recitation Time 4:00 pm 5:00 pm...

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Name: Recitation Time: 4:00 pm 5:00 pm Chemistry 1036: Quiz 1 1. (2 point)What is the change in internal energy (in Joules) of a system that gives off 85.6 J of heat and has 111 J of work done on it? E = q + w q = -85.6 J (heat is given off by the system ) E = -85.6 J + 111 J w = +111 J (the system has work done on it ) E = 25.4 = 25 J 2. (2 points) A piece of aluminum with a mass of 250.g is at an initial temperature of 5.00 o C. If 2410 J is supplied to warm the Al, what is its final temperature? The specific heat capacity of aluminum is 0.902 J/g o C. q = +2410 J c = 0.902 J/g o C ± T = ? mass = 250. g q = mass x c x T 2410 J = (250. g)(0.902 J/g o C)( ± T) ± T = 10.7 o C ± T = T final - T initial 10.7 o C = T final – 5.00 o C T final = 15.7 o C 3. (4 points) Given the following thermochemical equation for the thermite reaction, calculate the mass of aluminum (27.0 g/mol) that must react to release 617 kJ of heat. 2 Al(s) + Fe 2 O 3 (s) Æ Al 2 O 3 (s) + 2 Fe(s) ± Hº= -851.5 kJ Al mol 1 Al g 0 . 27 kJ 5 . 851 Al mol 2 kJ 617 = 39.1 g

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4. (4 points) Calculate Hº for: P 4 O 10 (s) + 6 PCl 5 (g) Æ 10 Cl
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Quiz1 Solutions - Name Recitation Time 4:00 pm 5:00 pm...

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