What did I do wrong?

[Nomvalt]

An equilbrium mixture consisting of hydrogen, iodine and hydrogen iodide was analysed. It was found that 1.1 mol of hydrogen and 3.3 mol of hydrogen iodide were present in a 3.0 L container at a temperature of 600 K.
a) If the value of the equlibrium constant, K, is 49 for the reaction:



calculate the concerntration of iodine.



Substituting the values for the concentration of hydrogen gas and hydrogen iodide and the value of 49 for K into:



we get:








However, the correct answer is supposed to be . Where did I go wrong?