Question

How many moles of neon(ne, 20.178g/mol) are in 68.4grams of neon

Answer 1

The mole is defined as the amount of substance that contains as many particles as there are atoms in in 12 grams of carbon.
`n=(m)/(M)`, n is number of moles, m is mass of atom in grams, M is the formula mass, hence neon has:

`n=(m)/(M)= (68.4 g)/(20.17 g/mol) = 3.39 mol\ Ne`