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Naturally occurring Rubidium is made up of two isotopes. Rubidium-85 has a mass of 84.9117 amu and Rubidium-87 has a mass o 86.9100 amu. Rubidium-85 makes up 72.15% 0f naturally occurring Rubidium. calculate the atomic weight(atomic mass) of element Rubidium.

Respuesta :

frazer380
Its basically just multiplication and addition.

We know the percent of naturally occurring Rubidium 85, so to get Rubidium 87 we subtract 72.15 from 100 which is: 27.85.

Then:
(.7215*84.9117) * (.2785*86.9100) = 61.2637916 + 23.204435 = 85.4682266

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