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Q.

16.8 grams of Magnesite on calcination liberates 3.36 litres of CO2 at STP.  Percentage Purity of Magnesite is

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a

 50%

b

60%

c

80%

d

75%

answer is D.

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Detailed Solution

84g                                                                22.4lit(STP)MgCO3s  MgO(s)+CO2g16.8g                                                         'X'  lit(STP)
X=16.884×22.4lit
X=4.48l
But only 3.36l of  CO2 at STP is liberated
Purity of Magnesite =3.364.48×100=75%

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16.8 grams of Magnesite on calcination liberates 3.36 litres of CO2 at STP.  Percentage Purity of Magnesite is