Question

The isotopes of Madeupium (Ma) and their abundance in nature are shown below. Which is the most likely estimate of what the atomic mass is close to?

Ma-74 (74.333 - 85%)

Ma-75 (74.999 - 10%)

Ma-76 (75.700 - 5%)

A. 74 g

B. 75 g

C. 76 g

Answer 1

A = 74 g

Step-by-step explanation:

Given data:

Ma-74 (74.333 - 85%)

Ma-75 (74.999 - 10%)

Ma-76 (75.700 - 5%)

Atomic mass close to = ?

Solution:

1st of all we will calculate the average atomic mass.

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass) / 100

Average atomic mass = (85×74.333)+(10×74.999)+(5×75.700) /100

Average atomic mass = 6318.305 +749.99+ 378.5 / 100

Average atomic mass= 7446.795/ 100

Average atomic mass = 74.467 amu

The average atomic mass is closer to the 74 g.