Homework Help: Chemistry

Posted by Sandra on Friday, May 11, 2012 at 1:32am.

A system is represented by the following equation:
2A(aq) + B(aq) --> 3C(aq)

At equilibrium, [C]=0.6 M. Calculate the value of K if initially 1 mol of A and 2 mol of B were placed in a 1 L flask.

Chemistry - Dr Russ, Friday, May 11, 2012 at 10:50am
we will assume that the aqueous solutions fill the 1 L flask.

At start

1 mol A + 2 mol B and 0 mol C

At equilibrium

1-2x mol of A and 2-x mol of B and 3x mol of C

so x=0.2 M

K=x^3/(1-2x)^2(2-x)

K=(0.2)^3/(0.6)^2(1.8)

K=0.008/(0.36)(1.8)

K=0.012 (with no units)

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