[DefaultSFWName]

hi, since covid i've had to learn my chemistry unit by myself and am struggling with this question

2SO2   +  O2   ⇋   2SO3

The results of an analysis of the equilibrium mixture which show that 40% of the 0.11 moldm-3 concentration of O2 has been used up.

Write an expression for the equilibrium constant, Kc, for this reaction and use the data to calculate the value of Kc.

i've got the expression, just don't know how to fill in the rest of the R.I.C.E table. how do i find the initial and change in concentrations for sulfur dioxide and sulfur trioxide

i would really appreciate your help

[chenbeier]

How much is 40% of 0.11 mol/dm³. From the chemical equation you can calculate how much SO₃  is then produced and how much SO₂ is consumed. And you know how much O₂ is left.

[DefaultSFWName]

Thank You!

[Borek]

Perhaps it is too early for me, but I don't see how to find SO₂ from the data given. No problem finding O₂ and SO₃ and SO₂ consumed, but without knowing initial SO₂ finding its equilibrium concentration seems impossible.

Unless we assume the mixture was stoichiometric, but if so, it should be clearly stated in the problem.