Question

Magnesium has the following isotope abundances: 24 Mg: 79.0%, 25 Mg: 10.0% and
20 Mg: 11.0%. What is the relative atomic mass of magnesium?​

Answer 1

Answer:

Explanation:

relative atomic mass =$\frac{[RA(1)*at.mass(1)] + [RA(2)*at.mass(2)] + [RA(3)*at.mass(3)] }{R(1)+RA(2)+RA(3)}$

where RA(1),RA(2)&RA(3)  are the relative abundance of isotope no.1, no.2,no.3 respectively

• put values in the eqn

RA(1)= 79.0%            at.mass(1)=24

RA(2)=10.0%             at.mass(2)=25

RA(3)=11.0%              at.mass(3)=20

• the final answer is...23.66