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  4. The mass of CaO that shall be obtained by heating 20 kg of 90% pure limestone (CaCO3) is

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Q. The mass of CaO that shall be obtained by heating 20 kg of 90% pure limestone $(CaCO_3)$ is

Some Basic Concepts of Chemistry

Solution:

$CaCo_{3} \to Cao+Co_{2}$
Pure lime in $20 \,kg = \frac{20 \times90}{100}=18\,kg$
$CaO$ produced $=\frac{56\times18}{100}$
$=10.08\,kg$