chem: mole concept

Question

a) What mass of ozone gas contains the same number of molecules as 48g oxygen gas?
b)a) What mass of ozone gas contains the same number of atoms as 48g oxygen gas?
please give detail step
thx a lot~

Answer 1

a)
48g of oxygen O2 contains 48 / (16X2) = 1.5 mole of molecules
1.5 mole of ozone O3 has mass (1.5)(16X3) = 72 g
b)
48g of O2 has 1.5 mole molecules and it is 1.5X2 = 3 mole oxygen atoms
1 mole ozone O3 has 3 mole oxygen atoms
1 mole ozone has mass = 16 X 3 = 48 g