<span>А)Сu2+ + </span>S<span>2- = </span>CuS<span> ; </span>Б)Pb(OH)2<span> + </span>2OH<span> - = PbO2</span><span>2- + 2H2O ; </span>
Msoli=80*0.1=8g
msoli2=80*0.15=12g
12-8=4g
Zn(OH)2 + 2HCl = ZnCl2 + 2H2O
Zn(OH)2 + 2NaOH = Na2ZnO2 + 2H2O
надеюся што так
точна не знаю
ызвыны эсли не верно
34 г х г
AgNO3 + NaCl = AgCl + NaNO3
170 г/моль 143,5 г/моль
х=34*143,5/170=28,7 г
Ответ: 28,7 грамм.
6. 200*0.01=2 (г) - вещ-ва, первый раствор
50*0.04=2 (г) - вещ-ва, второй раствор
![w= \frac{m_{1}+m_{2}}{m_{(p-pa)1}+m_{(p-pa)2}} *100](https://tex.z-dn.net/?f=w%3D+%5Cfrac%7Bm_%7B1%7D%2Bm_%7B2%7D%7D%7Bm_%7B%28p-pa%291%7D%2Bm_%7B%28p-pa%292%7D%7D+%2A100+)
![\frac{2+2}{200+50} *100= \frac{4}{250} *100=0.016*100=1.6](https://tex.z-dn.net/?f=+%5Cfrac%7B2%2B2%7D%7B200%2B50%7D+%2A100%3D+%5Cfrac%7B4%7D%7B250%7D+%2A100%3D0.016%2A100%3D1.6)
%
7.
![H_{2}SO_{4}+FeS=FeSO_{4}+H_{2}S](https://tex.z-dn.net/?f=H_%7B2%7DSO_%7B4%7D%2BFeS%3DFeSO_%7B4%7D%2BH_%7B2%7DS)
![n(FeS)= \frac{m(FeS)}{M(FeS)} = \frac{4.4}{88} =0.05](https://tex.z-dn.net/?f=n%28FeS%29%3D+%5Cfrac%7Bm%28FeS%29%7D%7BM%28FeS%29%7D+%3D+%5Cfrac%7B4.4%7D%7B88%7D+%3D0.05)
моль
![n(H_{2}S)=n(FeS)=0.05](https://tex.z-dn.net/?f=n%28H_%7B2%7DS%29%3Dn%28FeS%29%3D0.05)
моль
![V(H_{2}S)=n(H_{2}S)*V_{m}=0.05*22.4=1.12](https://tex.z-dn.net/?f=V%28H_%7B2%7DS%29%3Dn%28H_%7B2%7DS%29%2AV_%7Bm%7D%3D0.05%2A22.4%3D1.12)
л