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3 months ago

Chemical Thermodynamics Class 12th

Assuming ideal behaviour, the magnitude of log K for the following reaction at 25°C is x * 10-1. The value of x is ………………… (integer answer)

3HC  ≡ C H ( g ) ? C 6 H 6 ( I )

[Given : Δ f G ° ( H C ≡ C H )  = -2.04 * 105J mol-1 ; Δ f G ° ( C 6 H 6 ) = − 1 . 2 4 * 1 0 5 J   m o l − 1 : R = 8.314 JK-1mol-1]
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V
Vishal Baghel

Contributor-Level 10

3 C H ≡ C H ( g ) → C 6 H 6 ( l )       

Δ G 0 = − R T l n K . . . . . . . . . ( i )

Δ G 0 = ∑ Δ G 0 P − ∑ Δ G 0 R . . . . . . . . . . ( i i )    

Equating (i) & (ii)

-2.303 RTlogk = 4.88 * 105

l o g K = − 4 . 8 8 * 1 0 5 2 . 3 0 3 * R * T = − 4 8 8 0 0 0 5 7 0 5 . 8 4 8 = − 8 5 . 5 2 = − 8 5 5 * 1 0 − 1

So; magnitude of log K = 855 * 10-1

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