Question

an oxide of iron has 69.9% of iron and 30.1% of oxygen by mass how much Fe is present in 12 g of oxide

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Answer 1

Answer:

->The iron oxide has 69.9% iron and 30.1% dioxygen by mass.

->Thus, 100 g of iron oxide contains 69.9 g iron and 30.1 g dioxygen.

->The number of moles of iron present in 100 g of iron oxide is 55.869.9=1.25.

->The number of moles of dioxygen present in 100 g of iron oxide is 3230.1=0.94.

->The ratio of the number of oxygen atoms to the number of carbon atoms present in one formula unit of iron oxide is 1.252×0.94=1.5:1=3:2.

->Hence, the formula of the iron oxide is Fe2O

Explanation:

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