Quiz Key 2 - Chemistry 152A Quiz # 2 (April 15, 2008)...

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Chemistry 152A Tuesday Quiz (@ end of period) Quiz # 2 (April 15, 2008) Value: 10 points; Time: 10 minutes Name ______KEY __________________ Section _________________ Compare with problems Z9:50 Q) From the following data: () () () () () () 32 2 2 12 3 4 22 Og H k J H k J N Og Og N H k J →Δ +→ + Δ = 0 0 5 0 0 0 0 = = + a) Calculate H Δ for the reaction: ( ) ( ) ( ) 2 NO g O g NO g Rxn 3 given NO and NO 2 , To get O, turn Rxn 2 around and divide by 2 and add. () 2 3 2 N O gO g N O g O g ++ + 200 250 450 and H kJ Δ =− J Now need to get rid of O 3 , Multiply Rxn 1 by ½ and subtract it. This gives target reaction. 450 200 250 a Hk Δ= + = b) Calculate H Δ for the reaction: ( ) ( ) ( ) 2 NO g
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This note was uploaded on 05/02/2008 for the course CHEM 142,152,16 taught by Professor Unknown during the Fall '08 term at University of Washington.

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