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# Discussion4_ch14_071310_Answer - (a Q = 12.3 and K =...

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Finding K When the Equation Is Modified (5) Calculate K p for the reaction 2 SO 2 (g)+ O 2 (g) 2 SO 3 (g) given that K p for the reaction SO 2 (g)+ 0.5 O 2 (g) SO 3 (g) = 9.8x10 6 Notice that to get from the given reaction we have to multiply all coefficients by 2. Therefore K p for the desired reaction is K p (given) 2 = (9.8x10 6 ) 2 = 9.6x10 13 (6) Calculate K c for the reaction 2 Fe 3+ (aq) + 3 O 2- (aq) Fe 2 O 3 (s) given that K c for the reaction 5 Fe 3+ (aq) + 7.5 O 2- (aq) 2.5 Fe 2 O 3 (s) = 1x10 -4 Note that to get from the given equation to the desired one, we have to multiply all coefficients by 2/5 or 0.4. Therefore, K c for the desired reaction is K c (given) 0.4 = (10 -4 ) 0.4 = 2.5x10 -2 . (7) Calculate K c for the reaction I 2 (aq) + 2 S 2 O 3 2- 2 I - (aq) + S 4 O 6 2- (aq) given that K c for the reaction 2 I - (aq) + S 4 O 6 2- (aq) I 2 (aq) + 2 S 2 O 3 2- is 0.0369. When reversing a reaction K becomes 1 / K so the desired K c is 1 / 0.0369 = 27.1 The Reaction Quotient Q (10) Indicate whether a reaction is proceeding forwards towards products, backwards towards reactants or is at equilibrium for the following combinations of Q and K

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Unformatted text preview: (a) Q = 12.3 and K = 9.77x10-2 (b) Q = 1.00 and K = 128 (c) Q = 1.9x10-3 and K = 4.0x10-5 (d) Q = 10 30 and K =10 29 (e) Q = 0.003 and K = 0.003 (a) Q > K, backwards towards reactants (b) Q < K, forwards towards products (c) Q > K, backwards towards reactants (d) Q > K, backwards towards reactants (e) Q = K, at equilibrium Writing ICE tables (11) Write an ICE table (but don’t solve it) for 1.0 M SO 3 reacting with 2.0 M H 2 O according to the equation SO 3 (g) + H 2 O(g) H 2 SO 4 (g) (12) Write an ICE table (but don’t solve it) for 0.66 atm H 2 reacting with 1.28atm O 2 according to the equation 2 H 2 (g) + O 2 (g) 2 H 2 O(g) (13) In a container of 10.0 L volume, I mix 1.0 mol N 2 , 1.0 mol H 2 and 0.5 mol O 2 . Write an ICE table (but don’t solve it) for the equilibrium N 2 (g) + 4 H 2 (g) + O 2 (g) ? N 2 H 4 (g) + 2 H 2 O(g)...
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