Oxygen is a mixture of two isotopes 16-O and 18-O with relative abundances of 90% and 10% respectively. The relative atomic mass of oxygen is?
-
A.
16.0 -
B.
16.2 -
C.
17.0 -
D.
18.0
Correct Answer: Option B
Explanation
816O, 818O
90% 10%
R.A.M = (90)/(100) x 16 + (10)/(100) x 18 = 14.4 + 1.8 = 16.2