Q. Cortisone is a molecular substance containing 21 atoms of carbon per molecule. The molecular weight of cortisone is 360.4. what is the percentage of carbon in cortisone?
A) 59.9%
B) 75%
C) 69.98%
D) None of these
Explanation
(c)
Molecular weight of cortisone $= 360.4$
Molecular weight of 21 carbon atom $= 21 \times 12 = 252$
% of carbon in cortisone $= \frac{252 \times 100}{360.4}$
$= 69.9\%$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.