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Use the mass spectrum of europium to determine the atomic mass of europium. where the peak representing eu-151 has an exact mass of 150.91986 amu and percent intensity is assumed be to exactly 91.610%, and the peak representing eu-153 has an exact mass of 152.92138 amu and percent intensity of 100.00%. express your answer to two decimal places with the appropriate units.

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Answer: The atomic mass of a Europium atom is 151.96445 amu.

From the given information:

Percent intensity is 91.61% of Europium atom of molecular weight 150.91986 amu.

Percent intensity is 100.00% of Europium atom of molecular weight 152.92138 amu.

Abundance of Eu-151 atom:

[tex]X_{Eu-151}=\frac{0.9161}{0.9161+1.000}=0.4781[/tex]

Abundance of Eu-153 atom:

[tex]X_{Eu-153}=\frac{1.000}{0.9161+1.000}=0.5219[/tex]

Atomic mass of Europium atom:

[tex]A=(X_{Eu-151}\times150.91986+X_{Eu-153}\times152.92138)amu\\A=(0.4781\times150.91986+0.5219\times152.92138)amu=151.96445 amu[/tex]

Therefore, the atomic mass of a Europium atom is 151.96445 amu.

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