20 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample?
a)60 b)84 c)75 d)96
a)60 b)84 c)75 d)96
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Answer:
MgCO
3
→MgO+CO
2
The molar masses of MgCO
3
and MgO are 24+12+48=84 g/mol and 24+16=40 g/mol respectively.
Thus, 8 g MgO will be obtained from
40
84
×8=16.8 mg of MgCO
3
.
The percentage purity of magnesium carbonate in the sample is
20
16.8
×100=80%
Hence, the correct option is B
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