Question

How many moles are in 5.0 x 1025 atoms of iron?

3.0 x 1049 moles

0.012 moles

83 moles

6.02 x 1023 moles

Answer 1

@sammyalabamy

Answer 2

There are 6.02*10^23 atoms in 1 mole of iron.
1 mole --->6.02*10^23 atoms
x mole ---> 5.0*10^25
cross multiplication to workout what x is.

Answer 3

Note that 6.02*10^23 particles goes for one mole of any substance.