Question

How many moles of helium are in a balloon filled with 6.02 x 1025 atoms of helium? 10.0 moles 1.00 mole 100 moles 6.02 moles

Answer 1

We know that in 1 mole there is Avogadro’s number of atoms(no matter of what kind of mole) 6.02 x 10^23.

In order to find the number of moles we just apply the rule of three.
1 mole.............. 6.02 x 10^23.
x mole..............6.02 x 10^25

x = 6.02 x 10^25/6.02 x 10^23. = 10^2 = 100 moles