1. a, PTK CO2: 12 + 16 . 2 = 44 (đvC)
b, PTK H2O: 2 + 16 = 18 (đvC)
c, PTK KNO3: 39 + 14 + 16 . 3 = 101 (đvC)
d, PTK Fe2(SO4)3: 56 . 2 + (32 + 16 . 4) . 3 = 400 (đvC)
e, PTK Br2: 80 . 2 = 160 (đvC)
2. a, CuO
b, Al2O3
c, Ba3(PO4)2
3. nFe = 5,6/56 = 0,1 (mol)
nCl2 = 10,65/71 = 0,15 (mol)
PTHH: 2Fe + 3Cl2 -> (t°) 2FeCl3
LTL: 0,1/2 = 0,15/3 => ko có chất dư
nFeCl3 = 0,1 (mol)
mFeCl3 = 0,1 . 162,5 = 16,25 (g)