How would you write the empirical formula of an ion?
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So, if you assume that all the mass of iron took part in the reaction, you can say that the difference between the mass of the product and the mass of iron will represent the mass ofoxygen.
mproduct=miron+moxygen
moxygen=118.37 g−85.65 g=32.72 g
Now that you know how much iron and how much oxygen you have in the iron oxide, you can use the two elements' respective molar masses to figure out how many moles of each you have.
For iron, you will have
85.65g⋅1 mole Fe55.845g=1.534 moles Fe
mproduct=miron+moxygen
moxygen=118.37 g−85.65 g=32.72 g
Now that you know how much iron and how much oxygen you have in the iron oxide, you can use the two elements' respective molar masses to figure out how many moles of each you have.
For iron, you will have
85.65g⋅1 mole Fe55.845g=1.534 moles Fe
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