Question

What is the mass of 3.0 x 1023 atoms of neon

Answer 1

1 mole =6.0 * 10^23 atoms
3.0*10^23 atoms = 0.5 moles
the molar mass of neon is 20.18g/mole
0.5 moles = 10.09 grams

Answer 2

6.022×10^23 atom=20 gm
3×1023 atom= 20×3×1023/6.022×10^23
ans =1.019×10^-19