Question

Given that the percentage abundance of the isotope 10 Ne 20 is 90 % and that of the isotope 10 Ne 22 is 10 %, Calculate average atomic mass of Neon .

Answer 1

Answer:

average atomic mass of Neon=20.2

Explanation:

average atomic mass of Neon=(20×90+22×10)÷100

=(1800+220)÷100

=18+2.2=20.2

Answer 2

The average atomic mass of neon is 20.20.

Explanation:

Average atomic mass $= \frac{\sum \% abundance \times molar mass}{100}$

Here, two isotopes of neon are given.

Ne-10 with atomic mass 20, has a percentage abundance of 90%.

And Ne-10 with atomic mass 22, has a percentage abundance of 10%.

Thus we can write,

Average atomic mass

$= \frac{(90 \times 20) + (10\times 22)}{100}$

$= \frac{(1800) + (220)}{100}$

$= \frac{2020}{100}$

$= 20.20$

Thus the average atomic mass of neon is calculated to be 20.20.