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Mathman23
Oct20-04, 06:23 PM
Hi all,

I have the following equilibrium reaction \mathrm{2NO_{2} \leftrightharpoons N_{2} O_{4}} which has a tempeture of
\mathrm{t = 100 \ ^\circ C.}
The reactions takes place in a canister with a volume of 0,50 Liters, where the pressure at equilibrium is 1,6 bar.

Futhermore the equilibrium constant is found to be \mathrm{K_{c} = 5,0 M^{-1}}

a/ First I write the mass action expression K_{c} = \frac{\mathrm{[N_{2}O_{4}]}}{\mathrm{[NO_{2}]^2}}

b/ Second I calculate the amount of mol substance then the reaction is in equilibrium:

\mathrm{n_{equ}} = \frac{\mathrm{1,6bar \cdot 0,5 L}}{\mathrm{0,0831 \frac{bar \cdot L}{mol \cdot K}\cdot \ {373,0 K}}}= 2,6 \times 10^{-2} \ \mathrm{mol}

c/ How do I calculate [\mathrm{NO_{2}}] \ \mathrm{and} \ [\mathrm{N_{2} O_{10}}] ??

Many Thanks in advance.

Sincerely
Fred
Denmark