Question

Calculate the number of atoms in 3mol helium

Answers

Damon
3 times Avagadro's number

= 3 * 6.022 * 10^23

= lots of them

Hey saying you have a mol of something is the same as saying you have 6*10^23 of them. It is sort of like if you say you have a dozen everyone knows you have twelve.
Damon
By the way molecules of He is the same as atoms of He because there is one atom per molecule. If it had been H2 or O2 there would have been twice as many mols of atoms as mols of molecules.

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