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Equilibrium

Hi!! I am given the following exercise and I really don’t know how to do it. It says: “At a pressure of 1.50x10^5, 1.00 mol of sulfur dioxide gas, SO2, was mixed with 1.00 mol of oxygen gas, O2. The final equilibrium mixture formed was found to contain 0.505 mol of O2.

2SO2(g) + O2(g) < ———-> 2SO3 (g)

Calculate the amount in mol of SO2 and SO3 in the equilibrium mixture”can someone explain me how to do it please?
Work out how many initial moles there are. Calculate the change of moles with the o2. Use the change to finish the question.
Original post by VictiniCup
Work out how many initial moles there are. Calculate the change of moles with the o2. Use the change to finish the question.

I am sorry but How do I do that? Could you please expand on the explanation or solve one maybe?

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