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    How many oxygen atoms are present in a 5.26 g sample of Ca(NO3)2?
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    I could get this wrong but I'll give it a shot:

    First find how many moles of Ca(NO3)2 there are (mass/molar mass)
    Then find how many molecules of Ca(NO3)2 there are (Avogadro's number x moles)
    Then find how many atoms of oxygen there are (molecules of Ca(NO3)2 x 6)
 
 
 
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