Balance the following equation and determine the correct equilibrium constant ex

Question

Balance the following equation and determine the correct equilibrium constant expression K_c. C_2H_2(g) + H_2(g) doubleheadarrow C_2H_6(g) [C_2H_6]^2/[C_2H_2]^2[H_2] [C_2H_6]/[C_2H_2][H_2]^2 [C_2H_6]/[C_2H_2] [C_2H_2]/[C_2H_6] Which one of the following pairs of species are conjugate acid base pairs? HCl, HBr H_2SO_4,HSO^-_4 Hl, NaOH H_3O^+, OH- The pH of acid rain may be as low as 2 80. What is the [H_3O^+] in such acidic rain? 16 6.3 times 10^-12 9.7 times 10^-2 1.6 times 10^-3 Determine the pH of 0.35 M HOCI. The K_a of HOCl is 2.9 times 10^-8. 4.00 8.00 7.53 1.00 times 10^-4

Explanation / Answer

20.

First, do the balance:

C2H2 + H2 = C2H6

Balance H

C2H2 + 2H2 = C2H6

now

K = [proiducts]^p / [reactants]^r

so

K = [C2H6] / ([H2]^2[C2H2])

choose B, which is the only answer

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