Question: how many atoms are in the formula cuso4?
Answer: There are 1(Cu) + 1(S) + 4(O) + 5(2(H) + 1(O)) = 6 + 5x3 = 21 atoms per molecule. There are Avagadro's number of Molecules / Mole. There are The molecular weight grams in a mole W gram/Mole.