Calculate the mass in grams of each of the following substances. 6.02 x 10²³ atoms of mg

calculate the mass in grams of each of the following substances.
12.4 x 10¹⁵ molecules of ch₂o

calculate the mass in grams of each of the following substances.
3.01 x 10²³ formula units of cacl₂

     The mass of each substance can be found through stoichiometric calculation as follows:



where "g" is the mass of substance, "u" is the relative atomic mass, "a" is the number of atoms or molecules and "C" is Avogadro's number.
  
     Making use of that formula, we have:

a) 6.02 x 10²³ atoms of Mg.



b) 12.4 x 10¹⁵ molecules of CH₂O.



c) 3.01 x 10²³ formula units of CaCl₂