Naturally occurring europium (eu) consists of two isotopes was a mass of 151 and 153 . europium-151 has an abundance of 48.03% and europium-153 has and abundance of 51.97%. what is the atomic mass of europium?

152.04 u is the atomic mass of europium.

Given:

The two isotopes of europium(Eu).

Europium-151 has an abundance of 48.03% and Europium-153 has an abundance of 51.97%

To find:

The atomic mass of europium.

Solution:

Mass of Europium-151 = 151 u

The percentage abundance of Europium-151 = 48.03%

The fractional abundance of Europium-151 = 0.4803

Mass of Europium-153 = 153 u

The percentage abundance of Europium-153 = 51.97%

The fractional abundance of Europium-153 = 0.5197

The average atomic mass of Europium = A.M

152.04 u is the atomic mass of europium.

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151.94 u

Explanation:

The atomic mass of Eu is the weighted average of the atomic masses of its isotopes.

We multiply the atomic mass of each isotope by a number representing its relative importance (i.e., its percent abundance).

The atomic masses of Eu-151 and Eu-153 are 150.92 u and 152.92 u, respectively.

Set up a table for easy calculation.

0.4803 × 150.92 u =  72.472 u

0.5197 × 152.92 u  = 79.473 u

                 TOTAL = 151.94  u

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