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?