Question

Calculate the number of moles in 4.5x10^23 molecules of iron. Express answer to 2 significant digits and as a decimal

Answer 1

Since a mol is always a constant number = 6.022*10^23, to find how many moles there are in 4.5*10^23 molecules of iron we only need to do a simple math:

6.022*10^23 = 1 mol

4.5*10^23 = x moles

x = 0.7 moles