32х3
<span>ω (S) = --------------------- х 100% = 54,237%
</span> 27х2+32х3
Сa3(PO4)2 +3Mg(NO3)2 = 3Ca(NO3)2 + Mg3(PO4)2
CaCl2 + Fe(OH)2 = Ca(OH)2 + FeCl2
2NaBr + Li2SO3 = Na2SO3 + 2LiBr
n H2O = 1000/18 = 55,6 моль
N H2O = 55.6*6.02*10^23 = 3.34*10^25
1) CH =CH2+[O] + .H2O.. ->.....<span>CH2(OH)-CH20H</span>
<span>2ZnS + 3O2 --> 2ZnO + 2SO2
2 / S(-2) -6e --> S(+4) / восстановитель
3 / O2(0) +4e --> 2O(-2) / окислитель</span>