Question

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 :
(A) 176.5
(B) 252.2
(C) 287.6
(D) 360.1
Sample I has higher 018/016 ratio of atoms are compared to Sample II. The average mass of oxygen in Sample
I is .........that of Sample II :
(A) equal to
(B) greater than
(C) less than
(D) None of these
​

Answer 1

Answer:

The answer of first question is

D) 360.1

Explanation:

Percentage of carbon= Mass of carbon/total Mass × 100

69.98= 21×12/m × 100

m= 25200/69.98

m = 360.1