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4
[6] 4. A 1.00 g sample of N2O
5
gas was placed in an evacuated 1.00 L container
and heated to 773 K. When the endothermic dissociation reaction shown below reached
equilibrium, the total pressure inside the container was found to be 0.882 atm.
(endothermic)
a)
By using the information provided, calculate K
p
for the above reaction at 773 K.
b)
How would the percent dissociation of N2O
5
gas be affected by each of the
following changes in conditions? How would K
p
be affected in each case?
Write: increase, decrease or no change.
Effect on % Dissociation Effect on Kc
i)
Increase the temperature
___________________ _____________
ii)
Decrease the container volume ___________________ _____________
iii)
Add one mole of an inert gas
___________________ _____________
N2O
5
(g)
2 NO2(g) + 1/2 O2(g
