I know answer is C. Was hoping to get some explanation if possible. I know it de

Question

I know answer is C. Was hoping to get some explanation if possible. I know it depends on the stronger acid/base on whether its left or right but didn't understand this one. Thanks!

15. For the equilibrium 2 H2S(g) R 2 H20g) S20g) Keg 9.0 x 10 at 700°C the initial concentrations of the three species are 0.300 M H2S, 0.300 MH2 and 0.150 M S2. Is the system at equilibrium? If not, what concentrations (H2S, H2 or S2) must increase in order for the system to reach equilibrium? (a) Yes (b) No. CH2] and [S2] must increase. (c) No. [H2S must increase. (d) No. [Hz] alone must increase

Explanation / Answer

15)
Qc = [H2]^2 [S2] / [H2S]^2
= (0.300)^2 * (0.150) / (0.300)^2
= 0.15

Qc > Keq  

So, to reach equilibrium, the concentration of reactant must increase so that Qc decreases

For this to happen, [H2S] must increase

Answer: c

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