CHEM121-EXAMII-THERMO - b. endothermic, absorbed c....

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1. (6pts each) a. The value of ∆H o for the following reaction is -482 kJ. Determine the amount of heat (in kJ) exchanged with the surroundings when 14.0g of CO(g) completely reacts. 2CO(g) + O 2 (g) ----------> 2CO 2 (g) b. 65.0g of water at 69.0 o C is added to an unknown amount of water at 22.0 o C. The final temperature is 31.0 o C. How many grams of water were there initially at 22.0 o C? [Specific heat water = 4.184J/g o C]
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Multiple Choice/Short Answer : (1). 4Al(s) + 3O 2 (g) ---> 2Al 2 O 3 (s) ∆H o = -3351kJ The reaction shown above is __________ and therefore heat is _________ by the reaction. a. endothermic, released
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Unformatted text preview: b. endothermic, absorbed c. exothermic, released d. exothermic, absorbed (2). For the hypothetical reaction 3X 2 (g) ---- 2X 3 (g), H o is 333kJ and the atomic weight of X is 66.6 amu. H for conversion of 11.1g of X 3 gas into X 2 gas in kJ is a. 2.00 b. +2.00 c. 333 d. +9.25 e.-9.25 (3). Calculate the specific heat for metal X from the following information. 95g of metal at 75 o C are placed in 50.g of water (specific heat for water = 4.184J/g o C) at 18.0 o C. The final temperature is 23.0 o C. a. 23 b. 0.20 c. 0.76 d. 3.6...
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This note was uploaded on 06/04/2010 for the course CHEM 121 taught by Professor Heske during the Spring '08 term at University of Nevada, Las Vegas.

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CHEM121-EXAMII-THERMO - b. endothermic, absorbed c....

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