Question

A mole of helium gas contains 6.02x10^23 helium atoms. how many helium atoms are there in a millimole of helium? in a kilomole?

Answer 1

Please refer to the explanation.

Explanation:

Well, I'm not sure what a millimole and a kilomole are, but I assume that their conversions would be the same as in #1 \ "kilometer"=1000 \ "meters"# and so on.

So, `1 \ "mol"=1000 \ "millimoles"`

`1 \ "kilomole"=1000 \ "mol"`

Here, `1 \ "mol"=6.02*10^23`

`:.1 \ "millimole"=(6.02*10^23)/10^3=6.02*10^20` helium atoms

`:.1 \ "kilomole"=6.02*10^23*10^3=6.02*10^26` helium atoms

Answer 2

If `1` mole of helium gas contains `6.023*10^23` atoms,then `1` millimole i.e `10^-3` moles will contain `6.023*10^23*10^-3=6.023*10^20` atoms

Similarly, `1` kilomole i.e `10^3` moles of helium gas will contain `6.023*10^23*10^3=6.023*10^26` atoms