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24 July, 06:49

You heat 3.869 g of a mixture of fe3o4 and feo to form 4.141 g fe2o3. What is the mass of oxygen reacted?

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  1. 24 July, 10:06
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    The reaction is

    FeO + Fe3O4 + 1/2 O2---> 2Fe2O3

    Thus as shown in the balanced equation two moles of Fe2O3 are formed when 0.5 moles of O2 reacted with mixture of FeO and Fe3O4

    moles of Fe2O3 = MAss / Molar mass = 4.141 / 159.69 = 0.0259 moles

    So moles of O2 needed = 0.5 X 0.0259 = 0.01295

    Mass of O2 = moles X molar mass = 0.01295 X 32 = 0.4144 grams
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