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Homework Help: Finding number of Anions given grams

  1. Dec 10, 2014 #1
    1. The problem statement, all variables and given/known data
    How many anions are there in 1.50 g of MgBr2

    2. Relevant equations

    3. The attempt at a solution

    1.5 g MgBr2 x (1 mol MgBR2/184.3 g MgBr2) x (6.022 x 1023 anions/mol)

    which gave me answer of 4.91 x 1021

    the correct answer is 9.81 x 1021

    am i missing a step, or do i have to create a balanced equations? and use a mol to mol ratio?

    any help is greatly appreciated.
  2. jcsd
  3. Dec 10, 2014 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    How many moles of Mg2+? How many moles of Br-?
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