1.

All the oxygen in 0.5434g sample of pure oxide of iron is removed by reduction in a stream of H_(2). The loss in weight is 0.1210g. What is the formula of the oxide of iron ? (At. Mass of Fe = 56)

Answer»

SOLUTION :Iron oxide = 0.5434 g
Oxygen lost as `H_(2)O=0.1212g`
`therefore"Iron "=0.5434-0.1210=0.4224g`
`therefore""%" of FE"=(0.4224)/(0.5434)xx100=77.73%`
`%" of O=100-77.73=22.27%`

Hence, formula of iron oxide = FEO.


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