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2.0 g of a sample contains mixture of...

2.0 g of a sample contains mixture of `SiO_(2)` and `Fe_(2)O_(3)`. On very strong heating , it leaves a residue weighing `1.96 g`. The reaction responsible for loss of mass is given below .
`Fe_(2)O_(3)(s) to Fe_(3)O_(4)(s) + O_(2)(g)`, (unbalance equation) lt brgt What is the precentage by mass of `SiO_(2)` in original sample ?

A

`10%`

B

`20%`

C

`40%`

D

`60%`

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