Two vessels of equal volume are connected to each other by a value of negligible volume. One of the containers has 2.8 g of N 2 12.7 g of I 2 at a temperature T 1 . The other container is completely evacuated. The container that has N 2 and I 2 is heated to temperature T 2 while the evacuated container is heated T 2 /3. The value is now opened. Calculate the mass of N 2 in container
Text Solution
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Ans. 2.0 gram
Sol. Number of moles of N 2 in vessel
at T 1 = 
= 0.1
Number of moles of I 2 in
Vessel at T 1 = 
= 0.05
Vessel is heated to T 2 the evacuated vessel
is heated to T 2 /3. On opening stop-cock I 2
sublimes in and its vapours condense to solid
I 2 in . Let the number of moles of N 2 moved
from to at equilibrium be x.
Pressure of N 2 in = Pressure of N 2 in
One solving, x = 0.075
∴ Mass of N 2 is vessel = 0.7g
Mass of N 2 in vessel = 2.1g
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