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# Chapter 5,9 and 10 Notes-Answers - Chapter 9 1 Calculate...

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Chapter 9 1. Calculate ҏ ' H o rxn ҏ for the following reaction: ҏ kJ 10 2.22 - H O 4H CO 3 O 5 H C 3 ) ( 2 2(g) 2(g) (g) 8 3 u ' ± o ± " =-2219.9kJ/mol the rxn is exothermic so the -ve value makes sense. Chapter 5 If 1.00 x 10 2 mL of hydrogen, measured at 25.0 o C and 3.00 atm pressure, and 1.00 x 10 2 mL of oxygen, measured at 25.0 o C and 2.00 atm pressure, were forced into one of the containers at 25.0 o C, what would be the pressure of the mixture of gases? atm 5.00 = atm 2.00 + atm 3.00 P P P 2 2 O H Total ± Note: for each vessel if you know P,V,T you can set up an expression for n, and when the gases are combined, n total = n a + n b + n c . If the gases are already in the same container, then V and T will be the same, so you can just use symbols (V and T) and you'll find if you carry through the math then they should cancel out. Its often a good idea to leave R as a symbol too as it may cancel.. but it depends on the exact problem. Don t overlook the simple stuff also: if you ve got grams and the formula, you ve also got moles of that gas!

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Chapter 5,9 and 10 Notes-Answers - Chapter 9 1 Calculate...

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