a)
C6H5OH + 3Br2 → C6H2Br3OH + 3HBr
2C6H5OH + 2Na → 2C6H5ONa + H2
2CH3OH + 2Na → 2C2H5ONa + H2
b)
n C6H5OH = n C6H2Br3OH = 33,1/331 = 0,1(mol)
n H2 = 3,36/22,4 = 0,15(mol)
Theo PTHH :
n H2 = 1/2 n CH3OH + 1/2 n C6H5OH
<=> n CH3OH = 0,15.2 - 0,1 = 0,2(mol)
=> m = 0,1.94 + 0,2.32 = 15,8(gam)