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Homework Help: Law of Multiple Proportions

  1. Oct 7, 2011 #1
    1. The problem statement, all variables and given/known data
    The Problem goes as follows:

    Palladium forms three different compounds with sulfur. The mass of sulfur per gram of palladium in each compound is listed below:

    Compound Grams S per Gram Pd
    A 0.603
    B 0.301
    C 0.151

    Show that these masses are consistent with the law of multiple proportions.

    2. Relevant equations

    3. The attempt at a solution
    I feel as though this is a trick question: when I venture to find the ratio between C and B I come up with 2; but, when I multiple 3 by .151, I don't come out with .603. As I type this I am beginning to feel that I don't quite understand the ratio. Could some explain to me if this problem follows the Law of Multiple proportion; and, if so, how? And also, why doesn't multiplying .151 by 3 yield .603? Thank you
  2. jcsd
  3. Oct 7, 2011 #2


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    Homework Helper
    Education Advisor
    Gold Member

    Notice how each of the three ratios of S to Pd is different. A is two times B, and B is two times C.
  4. Oct 8, 2011 #3


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    Staff: Mentor

    Because it yields 0.453?

    Seriously: law of multiple proportions says that ratios are small integers, it doesn't say they have to be consecutive.
  5. Oct 8, 2011 #4
    Thank you both.
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