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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 percent by mass of `SiO_2` in original sample ?

Text Solution

Verified by Experts

The correct Answer is:
`40%`
`3Fe_(2)O_(3) rarr 2FeO_(3)O_(4)+1/(2)O_2`
`480"gm"Fe_(2)O_(3)rarrunderset(0.04"gm")(16gm )O_2`
`=1.2 gm :. (0.8)/2xx100=40%`
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