CBSE Class 11-science Answered
I read in my book that ' when a mixture of FeO and Fe2O3 is heated in air to a constant mass gains 5% by mass' . Please explain the meaning of this line.How mass gets increased
Asked by govtsecschoolnayaganv051 | 14 Dec, 2018, 07:21: PM
Expert Answer
Let the weight of FeO & Fe3O4 be 'x' & 'y' gm respectively.
2 FeO + 1/2 O2 → Fe2O3
Fe3O4 + 1/2 O2 → 3Fe2O3.
Since, 144 g FeO gives 160 g Fe2O3
'x' g FeO will give 160 x x/144 gm Fe2O3 (1)
Similarly, weight of Fe2O3 formed by ‘y’gm Fe3O4 = 160 x 3y/464 (2)
Assuming total weight i.e. (x+y) = 100. (3)
As there is an increase of 5 % we get, from eqn. 1,2 & 3
(160 x x /144) +160 x 3y/464 = 105
solving we get,
x= 21.06 & y = 78.94
So, there is an increase in mass of FeO and Fe2O3 from its original amount.
Answered by Sumit Chakrapani | 15 Dec, 2018, 11:19: AM
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