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Q.

Magnetite, Fe3O4, can be reduced to iron by heating with carbon monoxide according to the equation:

Fe3O4+4CO3Fe+4CO2

Molar mass g mol1
Fe3O4232

What mass of Fe3O4 is required in order to obtain 5.0kg of iron if the process is 88% efficient?

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a

6.1 kg

b

6.9 kg

c

7.9 kg

d

18 kg

answer is C.

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Detailed Solution

In the reaction we have,

Fe3O4+4CO3Fe+4CO2

556×13×232×10.88=7.9 kg

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Magnetite, Fe3O4, can be reduced to iron by heating with carbon monoxide according to the equation:Fe3O4+4CO⟶3Fe+4CO2Molar mass g mol−1Fe3O4232What mass of Fe3O4 is required in order to obtain 5.0kg of iron if the process is 88% efficient?