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quiz9_solutions

# quiz9_solutions - process if the resulting products are at...

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ECH 3023 Quiz 9 Fall 2006 1. (5 pts) 2 mol of solid NaOH(c) at 25 o C is mixed with 100 mol water at 25 o C. Calculate the heat removed to keep the resulting solution at 25 o C. Table B.11 is attached. ) 50 , 25 ( ˆ = = r H n Q o s = 2(-42.51) = -85.02 kJ 2. (5 pts) A mixture of 1 mol O 2 and 3 mol H 2 at 25 o C reacts at constant pressure (1 atm) to form H 2 O vapor. Calculate the amount of heat removed (or added) in this
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Unformatted text preview: process if the resulting products are at 1000 o C. Table B.8 is attached. Reaction: ½O 2 + H 2 ↔ H 2 O(v) = ∆ o r H ˆ-241.82 kJ/mol. Products: 2 mol H 2 0, 1 mol H 2 o r o H o H H C H C H Q ˆ 2 ) 1000 ( ' ˆ ) 2 ( ) 1000 ( ' ˆ ) 1 ( 20 2 ∆ +--+ = = 29.04 + 2(37.67)+2(-241.82) = - 397.26 kJ...
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