H↓2 (g) + I↓2 (g) = 2HI (g). At the given temperature Kc = 49 for the reaction. What is the value of Kp ?
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11th
Chemistry
States of Matter
Ideal Gas Equation
The Kp value for the reacti...
Chemistry
The Kp value for the reaction H
2
(g)+I
2
(g)⇌2HI(g) at 460
o
C is 49. If the initial pressure of H
2
and I
2
are 0.5 atm respectively, determine the partial pressure of H
2
,I
2
and HI gases at equilibrium.
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A
0.11 atm, 0.11 atm, 0.77 atm
H
2
+ I
2
→ 2HI
Initial : 0.5 0.5 0
At eq. : (0.5−x) (0.5−x) 2x
K
p
=
(0.5−x)
2
(2x)
2
=49
On solving the above equation, 2x=3.5−7x
9x=3.5
x=0.389
At equillibrium,Partial pressure of hydrogen, p
′
H
2
=0.5−0.389=0.111 atm
Partial pressure of I
2
,p
′
I
2
=0.5−0.389=0.111 atm
Partial pressure of hydrogen iodide , p
′
HI=2×0.389=0.77 atm