a) C3H8+O2----->CO2+H2O b)Na2CO3+HCl----->NaCl+CO2+H2O c)PBr3+H2O---->HBr+H3PO3 d)CaO+C---->CaC2+CO e) H2SO4+BaCl2----->BaSO4+HCl f)KClO3---->KCl+O2 g) HCl+Al----->AlCl3+H2 h) HNO3+Cu---->Cu(NO3)2+NO+H2O