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Quiz Key 2 - Chemistry 152A Quiz 2 Tuesday Quiz end of...

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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: ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) 3 2 2 3 2 2 1 2 3 4 2 2 3 2 O g O g H kJ O g O g H kJ NO g O g NO g O g H kJ Δ Δ + + Δ = − 00 500 00 = − = + 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. ( ) ( ) ( ) ( ) ( ) 3 2 2 3 2 NO g O g O g NO 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 H k Δ = − + = − b) Calculate H Δ for the reaction:
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