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At a certain temperature the equilibrium constant K C is 0.25 for the reaction A ( g ) + B ( g ) ⇌ C ( g ) + D ( g ) If we take 1 mole of each of four gases in a 10 litre container, what would be the equilibrium concentration of A(g)?

Options

  1. A0.331 M
  2. B0.033 M
  3. C0.133 M
  4. D1.33 M

Correct answer

C. 0.133 M

Step-by-step solution

The give reaction will go in backward direction K c = ( A ) × ( B ) ( C ) × ( D ) 4 = ( 1 + α ) 2 ( 1 - α ) 2 2 = 1 + α 1 - α 2 - 2 α = 1 + α α = 1 3 = 0.33 [ A ] = 1 + α 10 = 1 + 0.33 10 = 0.133 M

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