Question

What is the mass of one atom of neon if its gram atomic mass is 20 grams?

• A. $2.65\times {10}^{-23}$ grams
• B. $3.32\times {10}^{-23}$ grams
• C. $5.32\times {10}^{-23}$ grams
• D. $4.32\times {10}^{-23}$ grams

Answer 1

The correct option is B $3.32\times {10}^{-23}$ grams

1 mole of an element contains $6.022\times {10}^{23}$ atoms.
1 mole of a compound contains$6.022\times {10}^{23}$ molecules.

Neon is monoatomic in nature.
It is given that the gram atomic mass of Neon is 20 g

So, $6.022\times {10}^{23}$ atoms of Neon weigh = 20 grams

The mass of one atom
= $\frac{20}{6.022\times {10}^{23}}$
= $3.32\times {10}^{-23}$ g