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s Window Help session.masteringchemistry.com Course Home session.masteringchemistry.com apter 15 Ready-To-Go Teaching Module After Class: Finding Equilibrium Concentrations Practice 15.13-Enhanced- with Feedback Part A ou may want to reference 2ages 656-684) Section 15.8 while completing is problem. Find the equilibrium concentration of S2 Express the concentration to three significant figures and include th onsider the reaction for the decomposition of ydrogen disulfide 167 x 10 at 800 C The reaction is carried out at the same temperature with the following initial concentrations: si- 7.47-10 M HS 1.00 x10M Submit Previous Answers Request Answer H 0.00 AM S] 0.00 M × Incorrect: Try Again: 4 attempts remaining Provide Feedback teringChemist 4.

Explanation / Answer

Given the reaction is 2H2S(g) <-----------> 2H2(g)+ S2(g)

initial concentration of H2S(g)= 1*10-4 M

let x= concentration of S2 at equilibrium

hence at equilibrium, [S2]=x, [H2S]= 1*10-4-2x and H2= 2x

K= equilibrium constant = [S2] [H2]2/ [H2S]2= 1.67*10-7 , x*(2x)2/ (1*10-4-2x)2= 1.67*10-7,

4x3/(1*10-4-2x)2= 1.67*10-7, x3/(1*10-4-2x)2= 1.67*10-7/4= 4.175*10-8, when solved for x, x= 1.314*10-5 M

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