[Korokian]

A new definition for a mole has been developed by RUPAC.  According to this definition a mole is the amount of substance containing as many elementary entities as there are atoms in exactly 7 grams of ⁷Li.  The relative mass of ⁷Li on the ¹²C scale is 7.0160.  What is the value of Avagadro's Number according to the RUPAC definition?

so i figure out the number of atoms in 7 grams of ⁷Li is 6.01x 10²³ atoms
i don't know what elementary entities are and what i need to do with it.  can someone point me in the right direction?

[enahs]

~18 grams of H₂O is 1 moles of H₂O.
It however has 3 elementary entities.
2 moles of H and 1 moles of O.

Mole (taken directly for IUPAC)
“The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12; its symbol is "mol". “


Need more hints or is that enough?

[Borek]

~18 grams of H₂O is 1 moles of H₂O.
It however has 3 elementary entities.
2 moles of H and 1 moles of O.

No. Elementary entity in this context is a water molecule.

Mole is a 6.02*10²³ of something - molecules, atoms, ions, cars, carrots. These things that you count are elementary entities.

[enahs]

Borek is right. Do not post on a science form intoxicated kids.

[Korokian]

i'm still confused..so the answer is 6.008x10²³ then?

[Borek]

i'm still confused..so the answer is 6.008x10²³ then?

Looks OK with me. But I am known to be occasionally wrong

[Korokian]

thanks man... the wording kind of confuses me but i'll go with it....