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1. Homework Statement

When equal volumes of A and B are combined in a 3.5L flask, their initial concentrations were each 1.75mol/L. Once equilibrium is reached, the equilibrium concentration of c, is [c] = 0.65mol/L . determine the Kc for this reaction

2. Homework Equations

Usually, there is an initial value given, then the equilibrium value given, then you subttract those and plug them into the rest of the table. However... I don't know what to do inorder to get the answer when jus the eq val is given of c , and no data for d is given (assuming you need to find x first)

3. The Attempt at a Solution

I created the ice table

2A : 1.75-2x

B : 1.75 - x

c: 0.65

d: x

Attempt to solution was a failure. The answer is 0.022

Help please!