короче пиши так:
m(CuCl2)(rastvor1) + H2O => m(CuCl2)(rastvor2)
m(CuCl2)=m(rastvora2)*w2=500*0,02=10 gramm
m(rastvora1)=m(CuCl2)/w1=10 / 0,08 = 125 gramm - 1 otvet
m(H2O)=m(rastvora2)-m(rastvora1)=500-125=375 gramm - 2 otvet
fseeee)))
<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>
Решение во вложении
З.Ы. Не вижу последнее соединение
Привет!
4Al + 3O2 = 2Al2O3
n(Al) = 3.5/2*4 = 7 моль
m(Al) = 7 моль * 27 г/моль = 189 г
Ответ: 189 г
Вы должны 25+1792#блин мамка завет потом отвечу ок спасибо ок
