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20.0 g of a magnesium carbonate sample d...

20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g magnesium oxide. What be the percentage purity of magnsesium carbonate in the sample?

A

60

B

84

C

75

D

96

Text Solution

Verified by Experts

The correct Answer is:
B
`MgCO_(3)rarrMgO+CO_(2)`
The amount of `MgCO_(3)` required to produce 8 gm of `MgO=(8)/(40)xx84=16.8gm`
`"% purity "=(16.8)/(20)xx100=84`
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