2. Calculate the following quantities:
(a) mass, in grams, of 1.50 x 102 mol Cds
(b) number of moles of NH4 Cl in 86.6 g of this substance
(c) number of molecules in 8.447 X 10-? mol CoH
d) number of O atoms in 6.25 x 10-3 mol AI(NO3)3