Question

Calculate the average atomic mass of chromium. It's composition is: 83.79% with a mass of 51.94 Amy; 9.50% with a mass of 52.94 amu; 4.35% with a mass of 49.95 amu; 2.36% with a mass of 53.94 amu.

Answer 1

Youve gotta multiply the percentages by the masses. Like here
(.8379)(51.94)