ws3s08key - Spring 2008 CH 302 Worksheet 3 Below are listed...

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Spring 200 8 CH 302 Worksheet 3 Below are listed various reactions, stresses, and reaction components. Indicate how the amount of the indicated component changes when the stress is applied. Reaction Stress Component 1. 3 H 2 (g) + N 2 (g) 2 NH 3 (g) Addition of N 2 gas H 2 Answer: The amount of H 2 decreases , because the reaction shifts to the right to decrease the amount of N 2 present (adding N 2 decreases Q). 2. CH 3 OH (g) + 2 O 2 (g) CO 2 (g) + 2 H 2 O (g) Addition of heat CH 3 OH Answer: The amount of CH 3 OH increases , because this combustion reaction releases heat; therefore, it goes in reverse to consume heat. 3. CH 3 OH (g) + H 2 (g) CH 4 (g) + H 2 O (l) Addition of pressure CH 3 OH Answer: The amount of CH 3 OH decreases , because the reaction shifts to the right to decrease the pressure in the system; remember that liquids don’t contribute to pressure. 4. N 2 (g) + O 2 (g) 2 NO (g) Reduction of pressure O 2 Answer: The amount of O 2 does not change , because the reaction cannot shift to increase the pressure in the system (there are equal amounts of gas on each side). Give the equation for K c for the equations given in problems 5-8. 5. 2 H 2 (g) + 2 O 2 (g) 2 H 2 O (g) Answer: K c = [H 2 O] 2 /[H 2 ] 2 [O 2 ] 2 6. HCl (aq) + H 2 O (l) H 3 O + (aq) + Cl - (aq) Answer: K c = [H 3 O + ][Cl - ]/[HCl] 7. NaCl (s) Na + (aq) + Cl - (aq) Answer: K c = [Na + ][Cl - ] (This is known as Ksp, the solubility product for NaCl.) 8. C 8 H 18 (g) + 25/2 O
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ws3s08key - Spring 2008 CH 302 Worksheet 3 Below are listed...

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