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# Problem Set 4 Answer Key - Problem Set 4 Use Hess's law to...

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Problem Set 4 Use Hess’s law to determine the change in enthalpy for the reaction 2C (s) + H 2 C 2 H 2 given the following reactions. a) C (s) + O 2(g) CO 2 = -393.5 KJ b) H 2(g) + ½ O 2(g) H2O (l) = -285.8 KJ c) 2C 2 H 2(g) + 5O 2(g) 4CO 2(g) + 2H 2 O (l) = -2598.8 KJ 2C (s) + 2O 2(g) 2CO 2 = -787 KJ H 2(g) + ½ O 2(g) H2O (l) = -285.8 KJ 2CO 2 + H 2 O C 2 H 2 + 3/2 O 2 = 1299 KJ = 226KJ Write the net ionic equation for the following reaction: BaCl 2(aq) + Na 2 SO 4(aq) BaSO 4(s) + 2NaCl (aq) Ba 2+ + SO 4 2- BaSO 4 Calculate the Enthalpy of reaction for the reaction of igniting propane (C 3 H 8 ) in air to produce carbon dioxide and water. O-H 460 KJ, C-O 351KJ, O-O 498 KJ C-C = 347 KJ, C-H = 414 KJ, H-H = 436 KJ (Hint: Make sure you write a balanced reaction) Bonds Broke Bonds Formed C-C (2 x 347) = 694 KJ O-H (8 x 460) = 3680 KJ C-H (8 x 41) = 3312 KJ C-O (6 x 2106) = 2106 KJ O-O Bonds Broke – Bonds Formed = 710 KJ A pool that 7 ft wide, 10 ft. long, and 3 ft. deep is filled with water and is initially 10 o C.

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Obviously, this is much to cold to go for a swim, so the owner of pool decides to turn the
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