Mr(C2H6O2)=2*12+6*1+2*16=62
W(C)=2*12/62=0.387=38.7%
Ответ: А
Дано:
m (H20)=200г
найти H2
200 г Vx
3Fe+2H20---->Fe302+2H2
36 г/м 44.8л/м
v(h2)=200*44.8/36=248.9л
<em>А-<u>CH3Cl</u> - хлорметан</em>
<em>Б-<u>HCHO</u>- метаналь</em>
<em>CH4 + Cl2 = CH3Cl + HCl </em>
<span><em>CH3Cl + KOH = CH3OH + KCl </em></span>
<span><em>CH3OH + CuO = HCHO + H2O + Cu </em></span>
<span><em>HCHO + Ag2O = HCOOH + 2Ag </em>
</span>
Mn2O7, MnO2
Ba3P2
ZnCl2
FeO, Fe2O3