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Kc Question troubles!

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  1. Offline

    Here's the q:

    N2O4 and NO2 coexist in this equilibrium..

    2 NO2 <--=--> N2O4

    A chemist adds 4.00mol no2 to a container with a volume of 2dm3. The container is sealed, heated to a constant temp and allowed to reach equilibrium.

    the equilibrium mixture contains 3.2mol no2. Calculate Kc under these conditions.

    I understand everything up to the point where reacting ratio is 2:1 and that concentration of no2 is 1.6mol dm3. So I thought that the conc. of N2O4 would be 0.8, but markscheme says its 0.2. Why is this??
  2. Offline

    0.8 mol of NO2 has reacted, which means 0.4 mol of N2O4 is present according to the ratio in the chemical equation. Convert moles into concentration and it should be obvious :yes:


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