CrO + H2O<span> = </span>Cr(OH)2
<span>Cr(OH)3 = CrO(OH) + H2O</span>
<span>3MgO+P2O5->Mg3(PO4)2</span>
<span>N2O5 + H2O = 2HNO3</span>
<span>HCL+AL2O3=AlCl3+H2O</span>
<span>2KOH+N2O5=2KNO3+ H2O</span>
<span>Ca(OH)2 + CO2 → CaCO3↓ + H2O.</span>
<span>CR2O3+3H2SO4=Cr2(SO4)3 +3H2O</span>
<span> </span>
Дано: <span>m</span>(<span>Mg</span>)=36г;
Найти: <span>m</span>(<span>MgO</span>);
Решение.
1)<span>n</span>(<span>Mg</span>)=<span>m</span>/<span>M</span>=36г/24г/моль = 1.5 моль
2) 2<span>Mg</span>+<span>O</span>2=2<span>MgO</span>
Соотношение коэффициентов 2:2
=> <span>n</span>(<span>MgO</span>)=1.5 моль
=> <span>m</span>(<span>MgO</span>)=1.5 моль * 40 г/моль =60 г
<span>Ответ: 60 г</span>