Question #97654

1 Answer
Ernest Z.
Apr 30, 2017

K = 1.6 ×10^32K=1.6×1032

Explanation:

2"H"_2"O"_2 →2"H"_2"O" + "O"_22H2O2→2H2O+O2

ΔH^@ = "-196 kJ"
ΔS^@ color(white)(l)= "125.65 J·K"^"-1"

ΔG^@ = ΔH^@ -TΔS^@ = "-196 000 J" - 400 color(red)(cancel(color(black)("K"))) × "126.65 J"·color(red)(cancel(color(black)("K"^"-1")))

= "-196 000 J" - "50 660 J" = "-246 600 J""

ΔG^@ = "-RT"lnK

lnK = ("-"ΔG^@)/(RT) = -("-246 600" color(red)(cancel(color(black)("J"))))/("8.314 J"color(red)(cancel(color(black)("K"^"-1"))) × 400 color(red)(cancel(color(black)(K)))) = 74.15

K = e^74.15 = 1.6 ×10^32

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