04/17/18 0 Thisis a Numeric Entry question/It is worth 1 point/You have 3 of 3 a

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04/17/18 0 Thisis a Numeric Entry question/It is worth 1 point/You have 3 of 3 attempts remaining/ There is a 20% attempt penalty a See page 648 05 Question a point) The value of Kc for the thermal decomposition of hydrogen sulfide, shown below is 2.2 × 104 at 1400K 2H,s(g)-2H2(g)-S2(g) 1st attempt t See Periodic Table See Hint A sample of gas in which [H2S)-3.45 M is heated to 1400 K in a sealed vessel. After chemical equilibrium has been achleved, what is the value of [H2S]? Assume no H2 or S2 was present in the original sample. ?05,30 > SUBM 0 Type here to search

Explanation / Answer

         2H2S(g) <----> 2H2(g) + S2(g)

initial   3.45 M           -        -

change   -2x              +2x       +x

equil    3.45-2x           +2x     +x

3.45-3x = 3.45

Kc = [S2][H2]^2/[H2S]^2

(2.2*10^-4) = (((2x)^2*(x))/(3.45)^2)

x = 0.0868

at equilibrium,

[H2S] = 3.45-2*0.0868 = 3.2764 M

[H2] = 2*0.0868 = 0.1736 M

[S2] = x = 0.0868 M

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