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Homework Help: Law of combining volumes

  1. Oct 19, 2009 #1


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    1. The problem statement, all variables and given/known data
    Consider the reaction 2Bi2S3 +9O2 ---------> 2Bi2O3 +6O2

    The reaction is carried out and kept at 1.00 atm pressure and 174 C throughout. How many liters of O2 are needed to produce 3.87 L of SO2? How many grams of Bi2S3 are needed?

    3. The attempt at a solution

    my answer is 5.805 L O2 and 663.26 g Bi2S3. However, I don't know it is correct or incorrect. If it is wrong please explain to me why. Thank you!!!!

    3.87 LSO2 * 9LO2/ 6 L SO2 = 5.805 LO2

    5.805 mol O2 * 2molBi2S3/ 9molO2= 1.29 mol Bi2S3 * 514.155 g Bi2S3/1mol Bi2S3= 663.26g Bi2S3
  2. jcsd
  3. Oct 20, 2009 #2


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    Staff: Mentor

    Approach to the first part seems correct (even if there is no SO2 between products :wink: ).

    However, 5.805 L of O2 is not 5.805 moles of O2.

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