The molar mass as seen in periodic table
Cu = 63.546
S = 32.065
O = 16
CuSO4 - molar mass
63.6 + 32.1 + 16(4) - since it says that 4 oxygen [ O4 ] = 159.61 g/mol
The molecular mass of Copper sulfate is 159.61 g/mol
Same goes for Ammonium Carbonate
(NH4)2CO3
N = 14.01 (2)
C = 12.012
O = 16(3)
H = 1.008(4) (2)
The molecular formula of (NH4)2CO3 is 96.09 g/mol
