Neon has an average atomic mass of 20.2 g/mol, whereas argon has an average atomic mass of 40.0 g/mol. How would the number of atoms in a 1.0 mol sample of neon compare to the number of atoms in a 4.0 mol sample of argon?

The argon sample would have the same number of atoms as the neon sample.

The argon sample would have twice as many atoms as the neon sample.

The argon sample would have 4 times as many atoms as the neon sample.

The argon sample would have 8 times as many atoms as the neon sample.

Question

Neon has an average atomic mass of 20.2 g/mol, whereas argon has an average atomic mass of 40.0 g/mol. How would the number of atoms in a 1.0 mol sample of neon compare to the number of atoms in a 4.0 mol sample of argon?

 The argon sample would have the same number of atoms as the neon sample.

 The argon sample would have twice as many atoms as the neon sample.

 The argon sample would have 4 times as many atoms as the neon sample.

 The argon sample would have 8 times as many atoms as the neon sample.

sarahc · Answer

@jim_thompson5910

aaronq · Answer

A mole is a proportion, it is fixed and it means a certain amount always, 6.023x10^23.

Its analogous to saying "a dozen"

1 dozen of doughnuts = 12 doughnuts
1 dozen pineapples = 12 pineapples

1 mole of doughnuts = 6.023x10^23 doughnuts 
1 mole of argon atoms = 6.023x10^23 atoms

ps. Noble gases are monoatomic, meaning composed of only 1 atom, this is due to their full valence shell which makes them inert (unreactive).

Other gases like Oxygen gas or Nitrogen gas are diatomic, meaning that there is 2 atoms per molecule.

so 1 mole of Oxygen gas = 6.023x10^23 molecules

but there is twice as many atoms because its diatomic. 

so there is 2 x 6.023x10^23 atoms in one mole of oxygen gas.