How many formula units make up 30.4 g of magnesium chloride (mgcl2) ?

There are 1.923*10^23 formula units in 30.4g mgcl2

molar mass of mgcl2 = 95.211g/mol

magnesium = 24.305g/mol

chlorine = 35.45g/mol times 2

24.305 + (35.45*2) = 95.211g/mol

sample divided by molar mass times Avogadro's number gives u the formula units

30.4: 95.211 =.31929

.3193*6.022=1.9288