Chemistry, 05.07.2019 18:00 sierransha08

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?

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Answer from: irmaespinoza76ie

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

$A.M=\Sum{\text{Mass of isotope }\times \text{Fractional abundance of isotope}}\\=151u\times 0.4803+153u\times 0.5197=152.0394 u\approx 152.04 u$

152.04 u is the atomic mass of europium.

Learn more about the average atomic mass here:

link

Answer from: sundaywallace6361

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

Answer from: Quest

yes they ca is ur ansswerrr

Answer from: Quest

For cyclohexane compounds drawn in a chair conformation: -axial bonds are vertical -equatorial bonds are parallel to two bonds within the ring. thus, as i assume the chair conformation is drawn: -the x group is in an axial position, as are the five other vertical bonds. -three axial bonds are on the top face of the ring -the other three axial bonds are on the bottom face the position of the second substituent on each ring carbon is equatorial. gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other. drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1. click this link and watch some academic videos that may you more understand the topic

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Naturally occurring europium (eu) consists of two isotopes was a mass of 151 and 153 . europium-151...

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