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20.0g of a magnesium carbonate sample de...

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

A

60

B

84

C

75

D

96

Text Solution

Verified by Experts

The correct Answer is:
b
`underset( 24.3+12+48=84.3g)(MgCO_(3)) rarr underset( 24.3+16=40.3g)(MgO+CO_(2))`
40.3 g MgO `-=` 84.3g `MgCO_(3)`
8g MgO `= ( 84.3)/( 40.3) xx 8`
= 16.7 g
`"Percentage of purity "} = ( 66.7)/( 20 ) xx 100 = 83.67 ~=84%`
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