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:

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a

252.2

b

360.1

c

176.5

d

287.6

answer is D.

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Detailed Solution

Molar mass can be calculated as;

21×12M×100=69.98

= 360.1

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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: