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Question

11 moles N2 and 12 moles of H2 mixture reacted in 20 L vessel at 800 K. After equilibrium was reached, 6 mole of H2 was present. 3.58 L of liquid water is injected in equilibrium mixture and resultant gaseous mixture suddenly cooled to 300 K. What is the final pressure of gaseous mixture/? Neglect vapour pressure of liquid solution. Assume (i) all NH3 dissolved in water (ii) no change in volume of liquid (iii) no reaction of N2 and H2 at 300 K

(Given R=0.821 L atm mol1 K1)

A
18.47 atm
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B
60 atm
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C
22.5 atm
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D
45 atm
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Solution

The correct option is C 22.5 atm
N2+3H22NH3
Initial moles 11 12 0
at equilibrium 9 6 4
Moles of N2 and H2 present at equilibrium=9+6=15
After addition of water
NH3(g)+H2O(l)NH4OH(l)
Volume of vessel available for gaseous mixture of N2 and H2=203.5816.42 L
Pressure exerted by gaseous mixture at 300 KBy using the relation,PV=nRTP=nRTV=15×0.0821×30016.4222.5 atm

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