Question

21.
Element X (At no.12) has three Isotopes.
The table gives mass numbers of each isotope and its percentage abundance in a sample
of element X.
Mass Number 24 25 26
Percentage Abundance (%)
79 10 11
Calculate the relative atomic mass of element X.​

Answer 1

Answer:

u1= 24

% of u1=79%

u2= 25

% of u2= 10%

u3= 26

% of u3= 11%

relative atomic mass= ( u1×%+ u2×%+ u3×%)

= 24×79/100+ 25×10/100+ 26×11/100

=18.96+2.5+2.86

=24.32 u