Question

9092 amu and natural abundance 27.85%. Calculate the atomic mass of rubidium. View Available Hint(s) Rubidium has two naturally occurring isotopes: 85Rb, with mass 84.9118 amu and natural abundance 72.15%; and 87Rb, with mass 86.9092 amu and natural abundance 27.85%. Calculate the atomic mass of rubidium. 86.3529 amu 84.9118 amu 85.9105 amu 85.4681 amu

Answer 1

Answer:

85.4681  amu

Explanation:

We shall take weighted average of isotopes

Atomic mass of Rubidium

$=\frac{.7215\times 84.9118 + .2785\times 86.9092}{.7215+.2785 }$

= 61.26386 + 24.2042122

= 85.4681  amu .