Mole ConceptMedium
Question
Cortisone is a molecular substance containing 21 atoms of carbon per molecule. The mass percentage of carbon in cortisone is 69.98%. What is the molecular mass of cortisone?
Options
A.180.05
B.360.1
C.312.8
D.205.8
Solution
$69.98 = \frac{12 \times 21}{M} \times 100 \Rightarrow M = 360.1$
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