1) оба суждения неверны
2)Mg +2HCl = MgCl2 +H2
3)CuO +C = Cu +CO
m р-ра = V*p= 5000*1,01= 5050 г. W(NaCl)=0,9%. m(NaCl) =m р-ра*w= 5050*0,009= 45,45г.
1)2NaOH + CO2 = Na2CO3 + H2O
Na2CO3 + 2HCl = 2NaCl + H2O + CO2
<span>NaCl + AgNO3 = NaNO3 + AgCl
2)</span>Mg + 2HCI ---> MgCI2<span> + H</span>2
MgCI2<span> + 2NaOH --> Mg(OH)</span>2<span> + 2NaCI</span>
Mg(OH)2<span> ---(t)---> MgO + H</span>2O
MgO + H2SO4<span> ---> MgSO</span><span>4 </span>+ H2<span>O
3) не знаю
4)</span>CaCO3<span> --(t)--> CaO + CO</span>2
CO2<span> + C --> 2CO</span>
2CO + O2<span> ---> 2CO</span>2
Ca(OH)2<span> + CO</span>2<span> --> CaCO</span>3<span> + H</span>2<span>O
5)знаю, но не точно</span>