chem112-Q8 - u2018 Hatufb01w W H3730 u20182u2018...

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Haas) IGlVen the reaction 2NF3(g) + 2 A1C13;- (solid) 2 N2(g) + 2 All"3 80m)” aH = \SCarting with a system at equilibrium at 70°C, circle the e feet [increase (I), decrease (D), no effect (N)] of the operation in the left column on the equilibrium value of the quantity in the middle column, considering each operation separately. [Each answer is worth 5%.] Operation Eggilibrium Value of: Effect 1. He gas (1 atm) is added Number of moles of N2 I D N 2. He gas (1 atm) is added KD I D r N 3. A small amt. of AlF3 is removed* Number of moles of N2 I D N 4., A small amt. of AlF3 is removed* KP I D N -s. A catalyst is added* Number of moles of N2 I ,D N 6. A catalyst is added* I KP I D N 7. Temperature is increased Number of moles of N2 I D N 8. Temperature is increased KO I D N 9. Container volume is decreased Number of moles of N2 I D N J . Container volume is decreased KP I D N 11. man”) is added Number of moles of N2 I D N {'12. NEW) is added xp ' I D N 13. Some Clug) is removed Number of moles of N2 I D N 14. Some Clug} is removed KP ' I D N 15. He(g) (1 atm) is added Partial pressure of NF3 I D N 16. Temperature is decreased Number of moles of C12 I D N 17. N2”) is added Number of moles of N2 I D N *Negligible volume change 18. Write the equilibrium expression for KP for the above reaction: KP = 19. KP = KC(RT)x What is the value of X for the above reaction? X = 20. How are 46°: and KP related? Acor = __ - KP \-\\-\ §> Haw aveeeéé kg 1 vfl' , ~\ 0 0/191, 474% 021024 (1:25PM) Mme; 70 We 5 flgfl, 2003 Note: "A 10. '11. 12. 13. 15. A, :4 H m u 19. 20. Temperature is the only variable that affects the value of the equilibrium constant. No effect (does not change partial pressures of gases involved in equilibrium) No effect No effect (concentration of a solid is independent of amount) No effect No effect (rates of forward and reverse reactions affected equally) No effecr Decrease (reverse reaction, which uses up heat, is favored) Decrease Decrease (reverse reaction, which decreases pressure, is favored) No effect Increase (forward reaction, which uses up NFL is favored) No effect Increase (forward reaction, which produces ClL is favored) No effect No effect (PfifxnspT s as PT I x“? 13 'Pm reamains the same) Increase (forward reaction, which produces heat, is favored) Increase (only some of the added N2 will be used up) K = PN2 ‘ P3Cl /P2fiF (concentrations of solids do not appear in equilibrium expression P 2 3 since, at a given temperatgre, theg are constant.) PV=nRT, -.P=nRT/V=_rm1‘;.“ Kc=*_’1N ' flc1./ENF 2 2 3 '-K = (1- RT)(M RT)3/(M RT)2=K(RT)2 ' x=2 I P is 41 as c .. 2 2 3 a AG°r = -RT1nK P ...
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