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Question

Cortisone is a molecular substance that has 21 atoms of carbon per molecule. The mass percentage of carbon in cortisone is 69.98%. Its molar mass is:  
  1. 176.5
  2. 252.2
  3. 287.6
  4. 360.1


Solution

The correct option is D 360.1
Let the molar mass of Cortisone be x.

Given that it contains 21 carbon atom and the mass percentage of carbon in cortisone is 69.98%.

So, 12×21x×100=69.98
x=12×21×10069.98=360.10 

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