Answer:
5.027 × 10^-12 g
Step-by-step explanation:
Assuming the number of atoms given is;
- 1.5 × 10^11 atoms of Neon
We can get the mass of the atoms given;
- We need to know that 1 mole of an element contains atoms that are equivalent to the Avogadro's number.
- That is, 1 mole of an element = 6.022 × 10^23 atoms
In this case;
- 1 mole of Ne contains 6.022 × 10^23 atoms
- Therefore, to get the mass of the atoms given;
- Molar mass of Ne is 20.18 g/mol
Therefore;
20.18 g contains 6.022 × 10^23 atoms
Thus;
Mass = (20.18 g × 1.5 × 10^11 atoms) ÷ 6.022 × 10^23 atoms
= 5.027 × 10^-12 g
Therefore, 1.5 × 10^11 atoms of Neon contains a mass of 5.027 × 10^-12 g