(С6Н10О5)п + пН2О = пС6Н12О6
162 180
С6Н12О6 = 2С2Н5ОН + 2СО2
180 2*46=92
4т = 4000кг
находим массуС6Н12О6= 4000/162 = Х/180 Х=4444кг (С6Н12О6)
находим массу С2Н5ОН = 4444/180 = У/92 У =2271кг(С2Н5ОН)
находим выход С2Н5ОН = 720кг*100%/2271кг =31,7%
Ω% = m в-ва*100%/m р-ра
m в-ва = ω%*m р-ра/100% = 8*250/100 = 20 г
m воды = m р-ра - m в-ва = 250 - 20 = 230 г
25 гр х л
СаСО3=СаО+СО2
100 22.4 л
Мr(СаСО3)=100
х=25*22.4\100=5.6
Ответ 5,6 л
a)
1. 2Fe + 3Cl2 = 2FeCl3
2. FeCl3 + 3NaOH = 3NaCl + Fe(OH)3(осадок бурый)
3. 2Fe(OH)3 = Fe2O3 + 3H2O
4. Fe2O3 + 3CO = 2Fe + 3CO2
5. Fe + H2SO4(разб.) = FeSO4 + H2
6. FeSO4 + 2KOH = K2SO4 + Fe(OH)2(бурый осадок)
7. Fe(OH)2 = FeO + H2O
8. 2FeO + C = 2Fe + CO2
б)
1. CaCO3 = CaO + CO2
2. CaO + 5CO = CaC2 + 3CO2
3. CaC2 + 2H2O = Ca(OH)2 + C2H2
4. 3C2H2 = (t°C, кат.) C6H6
5. C6H6 + HNO3 = C6H5NO2 + H2O
6. C6H5NO2 + 3H2 = C6H5NH2 + H20(?)
в)
1. 2Na + O2 = Na2O
2. Na2O + H2O = 2NaOH
3. 2NaOH + CaCO3 = Na2CO3 + Ca(OH)2
4. Na2CO3 + H2O + CO2 = 2NaHCO3
5. NaHCO3 + HNO3 = NaNO3 + H2O + CO2
<span>Cu2S + HNO3 = Cu(NO3)2 + SO2 + NO +H2O.</span>
<span>2</span><span>HNO</span>3<span> => 2</span><span>NO</span><span> + </span><span>H</span>2<span>O</span><span> + 3</span><span><u>O</u></span>
<span /><span>Cu</span>2<span>S</span><span>=> 2</span><span>Cu</span><span>(</span><span>NO</span>3<span>)</span>2<span> + </span><span>H</span>2<span>SO</span>4
<span>Cu</span>2<span>S</span><span> + 4</span><span>HNO</span>3<span> => 2</span><span>Cu</span><span>(</span><span>NO</span>3<span>)</span>2<span> + </span><span>H</span>2<span>SO</span>4
<span>5</span><span><u>O</u></span><span> + Cu</span><span>2</span><span>S + 4HNO</span><span>3</span><span> => 2Cu(NO</span><span>3</span><span>)</span><span>2</span><span> + H</span><span>2</span><span>SO</span><span>4</span><span> + H</span><span>2</span><span>O</span>
<span>3<span>Cu</span>2<span>S</span> + 22<span>HNO</span>3 => 6<span>Cu</span>(<span>NO</span>3)2 + 3<span>H</span>2<span>SO</span>4 + 10<span>NO</span> + 8<span>H</span>2<span>O</span></span>
<span><span><span>1) сульфит натрия Na2SO3 - восстановитель.</span></span></span>
<span><span><span>2) сульфид меди Cu2S - восстановитель.</span></span></span>
<span><span><span>3) <span>Нитрат меди(II) Cu(NO3)2</span> - окислитель.</span></span></span>
<span><span><span>4) Оксид азота(<span>II)</span></span></span></span><span> NO - окислитель.</span>
<span>5) Вода H2o - восстановитель.</span>