Ar 33.95
Al 26.98
Br2 79.90×2=159.80
KOH 39.10+17.01=56.11
Ca(OH) 40.08+17.01×2=74.10
NH4NO3 14.01×2+1.01×4+16.00×3=80.06
FeCl3 55.85+35.45×3=162.20
CuSO4.5H2O 63.55+32.07+16.00×4+18.02×5=249.72