Na2SO4+BaCl2=BaSO4(белый осадок)+2NaCl
n(BaSO4)=m/M=46,6/233=0,2 моль
m(Na2SO4)=n*M=0,2*142=28,4 г
m(BaCl2)=n*M=0,2*208=41,6 г
зомеры: CH3-C(=O)-CH3 пропанон-2 или ацетон
<span>CH3-CH2-C(=O)H пропаналь </span>
гомологи: CH3-C(=O)-CH2-CH3 бутанон-2
CH3-CH2-CH2-C(=O)H бутаналь
Дано:m (Zn)=130г.
m(FeCl3+пр.)=150г.
w (примеси)=40%
m (Fe)-?
Решение:
1)m (FeCl3)=0.6*150=90 грамм
3Zn+2FeCl3 -->3ZnCl2 + 2Fe
2)M (FeCl3)=56+ 3*35.5=162.5г/моль
3)130/65 >90/325 , Zn в избытке
4)90/325=x/56*2
x=31 г
Ответ :m (Fe)=31 грамм
<span>1. Zn+<span>2<span>HCl</span></span> → <span>ZnCl2</span>+<span>H2
</span></span><span><span>3<span>Li2O</span></span>+<span>2<span>H3PO4</span></span> → <span>2<span>Li3PO4</span></span>+<span>3<span>H2O
</span></span></span><span><span>CuCl2</span>+<span>2<span>KOH</span></span> → <span>Cu<span>(OH)</span>2</span>+<span>2<span>K<span>Cl
2. </span></span></span></span>Zn+H2SO4 → ZnSO4+H2
<span>Zn+<span>CuO</span> → <span>ZnO</span>+Cu
</span><span>Zn+<span>H2O</span> → <span>ZnO</span>+<span>H2
</span></span><span><span>H2SO4</span>+<span>CuO</span> →<span>CuSO4</span>+<span>H2O
</span></span><span><span>H2SO4</span>+<span>Ca<span>(OH)</span>2</span>→<span>CaSO4</span>+<span>2<span>H2O </span></span></span>
<span><span>H2SO4</span>+<span>CO2</span> →<span>H2CO3</span>+<span>SO3
</span></span><span><span>H2SO4</span>+<span>Na2O</span>→ <span>H2O</span>+<span>Na2SO4
</span></span><span><span>CuO</span>+<span>H2O</span> →<span>Cu<span>(OH)</span>2 </span></span>
<span><span>CuO</span>+<span>CO2</span> →<span>CuCO3
</span></span><span><span>H2O</span>+<span>Na2O</span> →<span>2<span>NaO<span>H </span></span></span></span>
