PART B: MULTIPLE CHOICE. Select the best answer. For every question in this sect
ID: 552894 • Letter: P
Question
PART B: MULTIPLE CHOICE. Select the best answer. For every question in this section, you MUST SHOW YOUR WORK AND CALCULATIONS on a SEPARATE SHEET of paper. (10 points each) 21) The reaction below has a Kp value of 3.3 x 10-5 at 700 K. What is the value of Ke for this reaction at 700 K? 2503(g) 2 SO2(g) + O2(g) A) 5.7 x 10-7 1.7 × 106 C) 3.3 x 10-5 D) 3.0 x 104 E) 1.9 x 10-3 rthe following reaction, equilibrium concentrations, and equilibrium constant at a 2502(g) + O2(g) = 2 SO3(g) Kc = 1.7 x 108 [S03 leq = 0.0034 M 22) Conside particular temperature. Determine the equilibrium concentration of SO2(g). [Ozleq-0.0018 M A) 2.8 x 1013 M B) 1.88 M C) 6.1 x 10-6 M D) 1.0 x 103 M E) 1.4 M 23) A solution of a weak acid with a concentration of 0.294 M has a pH of 2.80. Determine the Ka of this acid. A) 1.2 x 10-5 B) 8.5 x 10-6 C) 2.7 D) 4.9× 10-7 E) 5.4 × 10-3 24) Calculate the pH of a solution formed by mixing 250.0 mL of 0.15 M NH4CI with 200.0 ml of 0.12 M NH3. The Kb for NH3 is 1.8 x 10-5 A) 9.06 B) 9.45 C) 4.55 D) 4.74 E) 9.26 Page 7
Explanation / Answer
21)
T = 700 K
delta n = number of gaseous molecule in product - number of gaseous molecule in reactant
delta n = 1
Kp= Kc (RT)^deltan
3.3E-5 = Kc *(0.0821*700.0)^(1)
Kc = 5.74*10^-7
Answer: 5.74*10^-7
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