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Posted by on Thursday, December 11, 2008 at 12:23am.

2SO2(g) + O2(g) ---> 2SO3

It says that 12.0 L of sodium trioxide are produced at 100 degrees celcius. What volume of oxygen is produced?

How would I go about doing this. I was going to use PV=nRT but I dunno the pressure so I can't find the moles. What do I do?

  • Chem. - , Thursday, December 11, 2008 at 12:38am

    a. SO3 is sulfur trioxide, not sodium trioxide.
    b. There is no oxygen produced. Oxygen is on the reactant side.
    c. In gaseous reactions, it isn't necessary to convert to mols. You may use volume directly; i.e., 12.0 L SO3 produced means 6.0 L oxygen were used (if the reaction goes to completion).
    d. note the correct spelling of Celsius.

  • Chem. - , Thursday, December 11, 2008 at 12:41am

    How do you know it was 6 L of oxygen? I don't understand :S

  • Chem. - , Thursday, December 11, 2008 at 10:09am

    The equation tells us (if the reaction goes to completion) that 1 mol O2 produces 2 mols SO3. Those are the coefficients in the balanced equation. Therefore,
    12 L SO3 x (1 mol O2/2 mol SO3) = 6 L O2.

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