Ответ:
![image](https://tex.z-dn.net/?f=BaO%2B2HNO_%7B3%7D%3DBa%28NO_%7B3%7D%29_%7B2%7D%2BH_%7B2%7DO%3B%20%5C%5C%20%3C%2Fp%3E%3Cp%3EHgO%2B2HCl%3DHgCl_%7B2%7D%2BH_%7B2%7DO%3B%20%5C%5C%20%3C%2Fp%3E%3Cp%3EFeO%2BH_%7B2%7DSO_%7B4%7D%3DFeSO_%7B4%7D%2BH_%7B2%7DO%3B%20%5C%5C%20%3C%2Fp%3E%3Cp%3E3Na_%7B2%7DO%2B2H_%7B3%7DPO_%7B4%7D%3D2Na_%7B3%7DPO_%7B4%7D%2B3H_%7B2%7DO.)
HgO+2HCl=HgCl_{2}+H_{2}O; \\
FeO+H_{2}SO_{4}=FeSO_{4}+H_{2}O; \\
3Na_{2}O+2H_{3}PO_{4}=2Na_{3}PO_{4}+3H_{2}O." alt="BaO+2HNO_{3}=Ba(NO_{3})_{2}+H_{2}O; \\
HgO+2HCl=HgCl_{2}+H_{2}O; \\
FeO+H_{2}SO_{4}=FeSO_{4}+H_{2}O; \\
3Na_{2}O+2H_{3}PO_{4}=2Na_{3}PO_{4}+3H_{2}O." align="absmiddle" class="latex-formula">
*под формулой оксида железа подразумевается формула FeO.