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###### Question 7 Calculate the pH of a solution that contains 0.25 M benzoic acid (C6H5CO2H) and...

Question 7 Calculate the pH of a solution that contains 0.25 M benzoic acid (C6H5CO2H) and 0.15 M sodium benzoate (C6H3COONa). [Ka = 6.5 x 10-5 for benzoic acid) O a, 4.83 O b. 3.97 O c. 4.19 O d. 3.40 O e. 4.41

Question 8 Hydrogen iodide decomposes according to the equation: 2 HI(g) 2 H2(g) + 12(g), for which Kc = 0.0156 at 400°C. Starting with an initial concentration of 0.550 M HI at 400°C, calculate the concentration of Hl at equilibrium. a. 0.138 M O b. 0.550 M OC. 0.440 M O d. 0.0275 M O e. 0.275 M

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