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Q.

Iron pyrite, FeS2 ( molar mass of  Fe: 56gmol−1), is converted into ferric oxide and sulphur dioxide. The mass of residue left behind from 1.08 g iron pyrite ignited to a constant mass in air would be

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a

0.46 g

b

0.72 g

c

0.54 g

d

0.85 g

answer is A.

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Detailed Solution

Molar mass of FeS2=(56+2×32)gmol−1=120gmol−1

Molar mass ofFe2O3=(2×56+3×16)gmol−1=160gmol−1

The reaction is 2FeS2+112O2⟶Fe2O3+4SO2

Hence, the mass of residue will be 1602×120×1.08g=0.72g

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