What is the answer with equation

Question

Strontium consists of four isotopes with masses of 84 (abundance 0.50%), 86 (abundance of 9.9%), 87 (abundance of 7.0%), and 88 (abundance of 82.6%). Calculate the atomic mass of strontium

Answer 1

Hello Angelo,

Mulitply the relative abundance (in decimal form, not as a percent) of each isotope times that isotopes mass and add them all together,

84(0.005) + 86(0.099) + 87(0.07) + 88(0.826) = 87.7 g/mol

87.7 g/mol