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Percent Yield Calculation?

  1. Jun 15, 2015 #1
    • Please post this type of questions in HW section using the template.
    Here is the question: If 75.0 g of potassium alum is obtained from 5.00 g of aluminum, what is the percent yield?

    This is what I've done so far, but I'm not sure if it is fully correct:
    5.00g Al x (1/26.98156) x (1/1) x 258.207 = 47.84882537g potassium alum

    Wouldn't this then be the theoretical yield? But then that wouldn't work because the actual yield of 75.0g is much greater... is there something I did wrong here?
  2. jcsd
  3. Jun 15, 2015 #2


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    Staff: Mentor

    And you expect us to guess what these numbers mean?

    Please start by writing the reaction equation. What is the formula of the alum? Hint: it is not just KAl(SO4)2.
  4. Jun 15, 2015 #3
    Another hint: You've been given a three significant figure problem. Piling on significant figures is neither useful nor impressive.
    Last edited: Jun 15, 2015
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