Al₂O₃

Fe(OH)₂ hoặc Fe(OH)₃

Ca₃(PO₄)₂

MgCl₂

C₂H₄+3O₂---> 2CO₂+2H₂O

2C₂H₆+7O₂---> 4CO₂+ 6H₂O

a, PTHH: PbO+H2---> Pb+H2O

n_H2= \(\dfrac{2,24}{22,4}=0,1\) (mol)

Theo pt: n_Pb= n_H2=0,1 mol

=> m_Pb=0,1.207= 20,7 (g)

b, Theo pt: n_PbO= n_H2= 0,1 mol

=> m_PbO= 0,1. 223= 22,3 (g)

PTHH: H2O+Na2O--->2NaOH

H2O+BaO---->Ba(OH)2

H2O+CaO---> Ca(OH)2

Na2O+2HCl---->2NaCl+H2O

BaO+2HCl---> BaCl2+H2O