Question

What is average RAM of copper including 70% Cu, RAM= 63 and 30% Cu, RAM= 65

Answer 1

Answer: 63.6 u

Explanation:
RAM = RAM of isotope-1 X (% abundance) + RAM of isotope-2 X (% abundance) ÷ 100

63 X 70% + 65 X 30% ÷ 100 = 63.6 u