Babypanda1
contestada

Copper is made of two isotopes. Copper-63 is 69.17% abundant and it has a mass of 62.9296 amu. Copper-65 is 30.83% abundant and it has a mass of 64.9278 amu. what is the weighted average of these two isotopes?

Respuesta :

Bigmokeyceline

To find the average mass of an element you add the mass of each isotope multiplied by it's relative abundance.

[(mass of Cuā¶Ā³)x(relative abundance of Cuā¶Ā³)] + [(mas of Cuā¶āµ)x(relative abundance of Cuā¶āµ0)]= average mass of Cu

[(62.9296)x(.6917)] + [(64.9278)x(.3083)] = 63.54amu

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