Question

4 moles each of SO2 and O2 gases are allowed to react to form SO3 in a closed vessel.At equilibrium 25% of O2 is used up. what is the total number of all the moles?

Answer 1

Total number of moles = 2 + 3 + 2 = 7

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Answer 2

2SO2 + O2 → SO3

2x x 2x

Initial 4 moles 4 moles o moles

Equi 2 moles 25*4/100 = 1 mole 2 moles

Final 4-2 = 2 moles 4-1 = 3 moles 2 moles

Total number of final moles = 2+3+2 = 7 moles