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  4. Cortisone is a molecular substance containing 21 atoms of carbon per molecule. The mass percentage of carbon in cortisone is 69.98 % . Its molar mass is

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Q. Cortisone is a molecular substance containing $21\, atoms$ of carbon per molecule. The mass percentage of carbon in cortisone is $69.98 \% .$ Its molar mass is

Some Basic Concepts of Chemistry

Solution:

Let molar mass be $M$.

Mass of 21 carbon atoms $=252$

$\%$ of carbon $=\frac{252 \times 100}{M}=69.98$

$ \Rightarrow M=360.1$