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March 30, 2017

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14 carat gold has a purity of 58.3%. How
many moles of gold are in 172 grams of 14
carat gold?
Answer in units of moles

  • AP Chemistry - ,

    g Au = 172 x 0.583 = ?
    Then mols = grams/atomic mass

  • AP Chemistry - ,

    I got 100.276. Do i divide that by 172?

  • AP Chemistry - ,

    No, mols = grams/atomic mass Au.
    100.276/196.966 = ?
    Watch the number of significant digits; especially if your prof is picky about that OR if you are typing these answers into a database.

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