Ba -> BaO -> Ba(OH)2 -> BaSO4 -> BaCl2
2Ba + O2 -> 2BaO
BaO + H2O = Ba(OH)2
Ba(OH)2 + H2SO4 = BaSO4 + 2H2O
BaSO4 + 2HCl = BaCl2 + H2SO4
C4H10+Br2→C4H9Br+HBr
C4H9Br+NaOH(спирт)→NaBr+H2O+C4H8
C4H8+H2O→C4H10O
<span>C4H10O+HBr</span>→<span>C2H5Br+H2O</span>
M(Na3PO4)=23*3+31+16*4=69+31+64=164