Question

20 gram of magnesium carbonate sample decomposes on heating to give carbon dioxide and 8 gram of magnesium oxide what will be the percentage purity of magnesium carbonate in the sample atomic mass of magnesium is 24 ​

Answer 1

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ANSWER::

MgCO₃ ⇒ MgO + CO₂

84g          40g

y g             8 g (y is variable used)

y=(84 x 8)/40 = 16.8 g

Percentage purity of MgCO₃  = (16.8 x 100)/20=84%

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