1) Calculate the mass of 0.01 mole of chlorine molecule. (Cl=35.5)
Step I
Write the formula of chlorine molecule, which is Cl₂

Step II
Using the formula
Number of moles of molecule =
    mass of molecule in g
    RMM
Make mass the subject of the formulae,
Mass of moles of molecule = number of molecule in g x RMM
Substitute the values