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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) . What is the percentage by mass of `SiO_(2)` in original sample ?

Text Solution

Verified by Experts

The correct Answer is:
`40%`
`3 Fe_2 O_3 to 2Fe_(3)O_(4) +1/2 O_2`
`480gm underset(?)(Fe_(2))O_3 to 16 underset(0.04 gm)( gm )O_(2)``=1.2 gm " ":. (0.8)/2 xx10=40%`
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