Question

4 moles of SO2 and O2 gases are allowed to react to form a so3 in a closed vessel at equilibrium 25% of O2 is used up the total number of moles of all the gases at equilibrium is

Answer 1

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