Question

Tyserium (ty) consists of two isotopes. one isotope has a mass of 331 amu and is 35.0 % abundant. the other isotope is 337 amu and is 65.0 % abundant. what is the mass of ty as it appears on the periodic table?

Answer 1

The atomic masses written for every element in the periodic table is the average atomic weight that is calculated from the element's isotopes. The formula would be:

Average Atomic Weight = ∑(Isotope Mass×Relative Abundance)
Substituting the values:
Average Atomic Weight = (331 amu×0.35) + (337 amu×0.65)
Average Atomic Weight = 334.9 amu

Answer 2

Answer: The average atomic mass of element Tyserium is 334.9 amu.  

Explanation:

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$ .....(1)

• For isotope 1:

Mass of isotope 1 = 331 amu

Percentage abundance of isotope 1 = 35.0 %

Fractional abundance of isotope 1 = 0.35

• For isotope 2:

Mass of isotope 2 = 337 amu

Percentage abundance of isotope 2 = 65.0 %

Fractional abundance of isotope 2 = 0.65

Putting values in equation 1, we get:

$\text{Average atomic mass of Ty}=[(331\times 0.35)+(337\times 0.65)]$

$\text{Average atomic mass of Ty}=334.9amu$

Hence, the average atomic mass of element Tyserium is 334.9 amu.