Question

Element X has two isotopes. The table gives information about these isotopes.

Isotope Atomic Mass (amu) Abundance (%)
X-63 62.9296 69.15
X-65 64.9278 30.85
The average atomic mass of element X is ____
amu.

Answer 1

Answer: The average atomic mass of element X is 63.545 amu.

Explanation:

The average atomic mass is can be calculated by the summation of the product of the atomic mass of each isotope multiplied by its abundance (abundance % / 100.0)

Element X has two isotopes:

1) At.mass = 62.9296 amu and its abundance = 0.6915

2) At.mass = 64.9278 amu and its abundance = 0.3085

The average atomic mass of element X = (62.9296 amu)*(0.6915) + (64.9278 amu)*(0.3085) = 63.454 amu

Answer 2

Answer:

63.55

Explanation:

I am going on from the person above since they made a few errors.

(62.926 amu * 69.15/100) + (64.9278 amu * 30.85/100)

(62.926 amu * 0.6915) + (64.9278 amu * 0.3085)

43.5158184 + 20.0302263

63.5460447

Remember to round to the nearest hundredth!

Your answer is 63.55

You are welcome.

~Kicho [nm68]