1.

Calculate the mass of iron which will be converted into the oxide (Fe_(3)O_(4)) by the action of 18 g of steam on it.

Answer»

Solution :The chemical equation representing the reaction is :
`underset("= 168 g")underset(3xx56)(3Fe)+underset("= 72 g")underset(4xx18)(4H_(2)O)RARR Fe_(3)O_(4)+4H_(2)`
Thus, 72 g of STEAM react with 168g of iron
`therefore"18 g of steam will react with "(168)/(72)xx18="42 g of iron"therefore"Mass of iron required = 42 g"`


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