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    Can someone help me on the chemistry sheet: C3.8d Moles in life?

    A sample of magnesium bromide (MgBr2) weighs 46g. How many moles of magnesium ions and bromide ions are in the sample?
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    first you work out how many moles of the total substance there is and then you multiply it by the number of specific ions in the molecule, in this case 1 magnesium and 2 bromides. so there are 0.25 moles of MgBr2 and therefore 0.25 moles of Mg+ and 0.5 moles of Br-
 
 
 
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