Question

Q.13. An element has two isotopes of atomic masses 63u and 65u .The relative abundances of these isotopes are 0.75 and 0.25 respectively. What is the average atomic mass of the element?​

Answer 1

Answer:

63.5u

63.5uExplanation:

63.5uExplanation:by applying formula

63.5uExplanation:by applying formula£%of each isotope×gram molecular mass of each isotope/100

Answer 2

The atomic masses are 63u and 65u.

the abundancies are 0.75 and 0.25.

The avg atomic mass:

(0.75)(63)+(0.25)(65)=47.25+16.25=63.5

So the avg atomic mass is 63.5u