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Question

5 moles of SO2 and 5 moles of O2 are allowed to react. At equilibrium, it was found that 60% of SO2 is used up. If the pressure of the equilibrium mixture is one atmosphere, the partial pressure of O2 is :

A
0.52 atm
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B
0.21 atm
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C
0.41 atm
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D
0.82 atm
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Solution

The correct option is C 0.41 atm
SO2+12O2SO3
Initial : 5mole 5mole 0mole
At eqn : 55×0.6 55×0.3 5×0.6
=2mole =3.5mole =3.0mole
total moles at equilibrium =2+3.5+3.0=8.5mole
pO2=xO2×P=3.58.5×1atm=0.41atm

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