Question

Rubidium has two naturally occurring isotopes: Rb-85 with mass 84.9118 amu and a natural abundance of 72.17 %, and Rb-87 with mass 86.9092 amu and a natural abundance of 27.83 fo

Answer 1

Given data - Isotopes of Rubidium Rb-85 with mass 84.9118 amu, abundance = 72.17% Rb-87 with mass 86.90g2 amu, abundance = 27,83% Isotopes: - Isotopes of a given element have the same number of protons but different number of neutrons. NO Atomic mass = (mass of Isotope 1) ( fractional abundance)t (mass of Isotope 2) (fractional abundance) Ova CS Scanne fractional abundance = % abundance | CamScanner 100

Atomic mass of rubidium =(84-9118 amu) (72.17 +(86.9092amul (27.03) - (84.9118amu) (0.7217) + (86.9092amu) (0.2783) = 61.2808 amu +24.1868 a mu Atomic mass of subidium = 85.4676amu Atomic mass = 85.4676 amy Scanned with CamScanner ES