Cu(OH)₂=t=CuO↓+H₂O↑
CuO+H₂=Cu↓+H₂O
Cu+Cl₂=CuCl₂
CuCl₂+2NaOH=Cu(OH)₂↓+2NaCl
H₂+Cl₂=2HCl
HCl+NaOH=NaCl+H2O
2NaCl+H₂SO₄=2HCl+Na₂SO₄
<span>Na</span>₂<span>SO</span>₄<span>+Ba(OH)</span>₂<span>=2NaOH+BaSO</span>₄↓<span>
</span>
2Al+3S=Al₂S₃
Al₂S₃+6HCl=2AlCl₃+3H₂S↑
AlCl₃+3KOH=Al(OH)₃↓+3KCl
2Al(OH)₃=Al₂O₃↓+3H₂O↑
2Fe+3Cl₂=2FeCl₃
FeCl₃+3NaOH=Fe(OH)₃↓+3NaCl
2Fe(OH)₃=t=Fe₂O₃↓+3H₂O↑
<span>Fe₂O₃+3SO₃=Fe₂(SO₄)₃</span>
А) Ca3P2 + 6<span>HCl </span>= 3CaCl2 + 2PH<span>3
</span>2PH3 + 4O2 =<span> P</span>2O5 + 3H2<span>O
</span>P2O5 + 6<span>NaOH </span>= 2Na3PO4 + 3H2O
б) FeO + CO = Fe + CO2
Fe + 2<span>HCl </span>=<span> FeCl</span>2 +<span> H</span><span>2
</span>FeCl2 + 2<span>NaOH </span>=<span> Fe(OH)</span>2 + 2<span>NaCl
</span>4Fe(OH)2 +<span> O</span>2 + 2H2<span>O </span>= 4Fe(OH)3
в) Na2<span>O </span>+ 2<span>HBr </span>= 2<span>NaBr </span>+<span> H</span>2<span>O
</span>2<span>NaBr </span>+<span> Cl</span>2 = 2<span>NaCl </span>+<span> Br</span><span>2
</span>NaCl +<span> AgNO</span>3 =<span> NaNO</span>3 +<span> AgCl</span>
г) C + O2 = CO2
CO2 + 2<span>NaOH </span>=<span> Na</span>2CO3 +<span> H</span>2<span>O
</span>Na2CO3 + 2HNO3 = 2NaNO3 +<span> H</span>2<span>O </span>+<span> CO</span><span>2</span>
2P2O5 + 6H2O2 = 4PH3 + 11O2
M=350 г
w=0,12
р(Н₂О)=0,9982 г/мл
масса сульфида натрия:
m(Na₂S)=mw
m(Na₂S)=350г*0,12=42 г
масса воды:
m(H₂O)=m(1-w)
объем воды:
v(H₂O)=m(1-w)/р(Н₂О)
v(H₂O)=350г*(1-0,12) / 0,9982г/мл=308,6 мл
42 г сульфида натрия и 308,6 мл воды
Mr(CaCO3) = 40 + 12 + 16*3 = 100
W(Ca) = Ar(Ca) *n / Mr(CaCO3) *100% = 40 *1 / 100 *100% = 40%
W(C) = Ar(C) * n / Mr(CaCO3) *100% = 12 *1 / 100 *100% = 12%
W(O) = Ar(O) * n / Mr(CaCO3) *100% = 16 *3 / 100 *100% = 48%