Question #: 20 Mustard gas, a chemical warfare agent used in World War I, has be

Question

Question #: 20 Mustard gas, a chemical warfare agent used in World War I, has been shown to be effective in the treatment of Hodgkin's disease. It can be produced according to the equation: SC29)+2 C2H()S(CH2CH2C)29) Kc 1434 If the inital concentration of all three substances is o.100 M, is the reaction at equilibrium? If not, in which direction will the reaction proceed? A. The reaction will proceed to the right (towards products). /B. The reaction will proceed to the left (towards reactants). C. The reaction is at equilibrium.

Explanation / Answer

In this case we need to find the reaction quotient Q of the reaction.

If Q < Kc reaction will go in forward direction

If Q > Kc reaction will go in backward direction

If Q = Kc equilibrium

Now for Q,

Q = Product/ Reactant

Q = (0.1) / (0.1)(0.1)2 = 100

clearly Q > Kc , hence reaction will go in backward direction.

So option B is correct

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