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Homework Help: Ap chem

  1. Sep 13, 2010 #1
    1. The problem statement, all variables and given/known data
    5.0 g of Zn is heated with an equal amount of S, bow much zinc sulfide is produced?

    2. Relevant equations

    3. The attempt at a solution

    Wouldn't there be an equation to solve this problem? I know law of constant composition is an observation that the elemental composition of a pure compound is always the same.
  2. jcsd
  3. Sep 13, 2010 #2
    By equation do you mean a chemical equation?

    You have 5.0 g of Zn and 5.0 g of S, you need to find out which is the limiting reagent.
  4. Sep 13, 2010 #3
    Okay, then do you have to do a balanced chemical equation?
  5. Sep 13, 2010 #4
    I would start with that first.
  6. Sep 13, 2010 #5
    5 Zn --> 5 S

    Do you mean something like this? I really do appreciate this alot, thanks for your help
  7. Sep 13, 2010 #6
    Zn and S are the reactants, so they go on the left side.

    Zn + S → ZnS
    (now you know what the equation is)

    The masses of the reactants don't have a part in the equation itself at all.
    Last edited: Sep 13, 2010
  8. Sep 13, 2010 #7
    ok thanks a lot for this
  9. Sep 13, 2010 #8
    Do you know how to convert grams of a substance to moles? I would first start changing all the grams to moles.
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