Chemistry - Chemical Equilibrium Question with Solution | TestHub
ChemistryChemical EquilibriumProblems involving KpMedium2 minQB
ChemistryMediumsingle choice
The same initial amounts of nitrogen and hydrogen are placed in an identical flask without a catalyst. Before appreciable reaction occurs, its temperature is raised to 720 K. What pressure is measured?
Options:
Answer:
C
Solution:
At equilibrium in the catalysed experiment, hydrogen has amount 0.40 mol. Producing 0.20 mol ammonia consumes 0.30 mol hydrogen, so the initial hydrogen amount was 0.70 mol.
The unreacted initial mixture therefore contains 0.30+0.70=1.00 mol gas.
At fixed volume before reaction, P=nRT/V=(1.00)(0.0821)(720)/4.926=12.0 atm.
The equilibrium mole amount must not be used for the unreacted mixture.
This is option (c).
Stream:JEESubject:ChemistryTopic:Chemical EquilibriumSubtopic:Problems involving Kp
⏱ 2mℹ️ Source: QB
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