A mixture of 10 moles of A, 5 moles of B and 15 moles of C is placed in a one liter container at a constant temperature. The reaction is allowed to reach equilibrium. At equilibrium the number of moles of B is 9. Calculate the equilibrium constant for the reaction.

Equilibrium constant is 0.0873

Explanation:

For the reaction:

A + B ⇄ C

Equilibrium constant is defined as:

K = [C] / [A] [B]

concentrations in equilibrium of each reactant are:

[A] = 10 - X

[B] = 5 - X

[C] = 15 + X

If concentration in equilibrium of B is 9, X is:

[B] = 5 - X = 9 → X = -4

Replacing:

[A] = 10 - (-4) = 14

[B] = 5 - (-4) = 9

[C] = 15 + (-4) = 11

K = 11 / (14×9) = 0.0873

Thus, equilibrium constant is 0.0873

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

so she was walking and she stepped on warm jeffy , uh uh uhh dadye i just pooped my pants