20) 20) Determine the value of Kc for the following reaction if the equilibrium
ID: 697971 • Letter: 2
Question
20) 20) Determine the value of Kc for the following reaction if the equilibrium concentrations are as follows: [N2kq = 1.5 M, [H2leq = 1.1 M, [NH3 leg = 0.47 M. N2(g) + 3 H2(g) -2 NH3(g) A) 3.5 B) 0.11 C) 0.28 D) 9.1 E) 0.78 21) A molecule with a trigonal bipyramidal molecular geometry has a bond angle of 21) A) 180° B) 120° C) 109.5 D) 120, 90 E) 90 22) 22) Use the standard reaction enthalpies given below to determine 1rn for the following reaction: 25(s) + 3 O2(g) 2 SO3 (g) Given: SO2(g) S(s) + O2(g) 2502(g) +02(g)2SO3(g) AHrxn-+296.8 kJ 1°rxn.-197.8 kJ A) 1583 kJ B) -692.4 k] C)-494.6k D)-293.0 k] E) -7914 kJExplanation / Answer
20) Kc = [NH3]^2/[N2][H2]^3
= 0.47^2/(1.5*1.1^3)
= 0.11
ANSWER: B
21) answer: D. 120,90 degrees
22)
2* (S(s) + O2(g) ---> SO2(g) DH1 = -296.8)
2so2(g) + o2(g) -----> 2so3(g) DH2 = -197.8
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2S(s) + 3O2(g) ---> 2so3(g) DH = 2*DH1+DH2
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DH = 2*-296.8+(-197.8) = -791.4 Kj
ANSWER: E
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