Lithium exists in nature in the form of two isotopes, Li-6 and Li-7 with atomic masses 6.0151u and 7.0160u and the percentages 8.24 and 91.76 respectively. Calculate average atomic mass.

The natural lithium is composed of two isotopes of ""_(3)Li^(6) and ""_(3)Li^(7) . The isotopes have masses 6.015121 amu and 7.016003 amu, respectively. Calculate the relative abundance of each isotope in the natural lithium if the atomic mass of natural lithium is 6.94 amu.

The element bron occurs in nature as two isotopes havein atomic masses 10 u and 11 u . What are the percentage abundances of these isotopes in a sample of boron having average atomic mass of 10.8 u?

Carbon occurs in nature in the form of two isotopes with atomic mass 12 and 13 respectively. If average atomic mass of carbon is 12.011 u , what is the % abundance of the two isotopes ?

Chlorine occurs in nature in two isotopes forms of masses 35 u and 37 u in the ratio of 3:1 respectively. What is the average atomic mass of the Chlorine atom ?