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    rlsaldan's Avatar
    rlsaldan Posts: 1, Reputation: 1
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    #1

    Feb 28, 2010, 05:48 PM
    How many calcium atoms are in 51.0 g of calcium?
    I'm working on chemistry homework and I don't understand how to figure this problem out.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Mar 1, 2010, 06:34 AM

    You need to find the amount of moles of Calcium you have in 51.0 g of Calcium.

    The atomic weight of Calcium is 40.

    So, 40 g of calcium has 1 mole.

    Find the number of moles 51 g of Calcium contains.

    Then, 1 mole contains 6.02x10^23 particles, in this case, 1 mole contains 6.02x10^23 atoms.

    When you have the number of moles, you can find the number of atoms! :)

    Post your answer. :)
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