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2.0g of a sample contains mixture of SiO...

`2.0g` of a sample contains mixture of `SiO_2 and Fe_2O_3`. On very strong heating, it leaves a residue weighing `1.96 g`. The reaction responsible for loss of mass is given below. `Fe_2O_3(s)rarrFe_3o_4(s)+O_2(s)`, (unbalance equation) what is the percentage by mass of `SiO_2` in original sample ?

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