When a mixture consisting of 10 moles of SO2 and 16 moles of O2 were passed over a catalyst, 8 mole

Question

When a mixture consisting of 10 moles of SO2 and 16 moles of O2 were passed over a catalyst, 8 mole of SO3 were fomed at equilibrium. The number of moles of SO2 and O2 which did not enter into reaction were

Accepted Answer

This application of mole concept will be discussed in chemical equilibrium chapter
        2SO₂ (g) + O₂ (g) ⇋ 2SO₃ (g)
At t = 0                 10             16             0
At equilibrium     (10 - 2x)    (16 - x)     2x = 8
    2x = 8
    x = 4
Thus, number of moles of SO₂ unreacted is 10 - 2x = 2
∴   Number of moles of O₂ unreacted
                 = 16 - x = 12

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