Question

how many grams of neon will have the same number of atoms as 4 gramsof calcium?

Answer 1

4 grams of calcium = 4/40moles
moles of calcium =0.1 mol
0.1 mol of neon will have same no. of atoms as 4 g of calcium
0.1 mol of neon = 0.1*20=2 grams

Answer 2

Number of particles in 4 g of Ca,

= 4/40×6.022×10²³

= 6.022×10²² atoms

Therefore, number of atoms of Ne same as 4 g of Ca

= 20×6.022×10²²/6.022×10²³

=20/10

=2 g