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Q.

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

 (At.wt.of Mg=24 ) 

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a

96

b

60

c

75

d

84

answer is C.

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Detailed Solution

detailed_solution_thumbnail

MgCO3→MgO+CO284gm→40gm?→8g
Mass of MgCO3 =840×84=16.8g
Percentage purity= Mass of pure sample  Mass of impure sample ×100 
=16.820×100=84%

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