Balance the following chemical equations and include state symbols: 14. BaF2 + Mg -> MgF2 + Ba 15. Mg(OH)2 -> MgO + H2O 16. Na2HPO4 -> Na4P2O7 + H2O 17. CO2 + H2O -> C6H12O6 + O2 18. Pb(NO3)2 -> PbO +

Here are the balanced chemical equations with state symbols:

14. BaF$_2$ + Mg $\rightarrow$ MgF$_2$ + Ba

$$\text{BaF}_2\text{(s)} + \text{Mg(s)} \rightarrow \text{MgF}_2\text{(s)} + \text{Ba(s)}$$

15. Mg(OH)$_2$ $\rightarrow$ MgO + H$_2$O

$$\text{Mg(OH)}_2\text{(s)} \rightarrow \text{MgO(s)} + \text{H}_2\text{O(g)}$$

16. Na$_2$HPO$_4$ $\rightarrow$ Na$_4$P$_2$O$_7$ + H$_2$O

$$2\text{Na}_2\text{HPO}_4\text{(s)} \rightarrow \text{Na}_4\text{P}_2\text{O}_7\text{(s)} + \text{H}_2\text{O(g)}$$

17. CO$_2$ + H$_2$O $\rightarrow$ C$_6$H$_{12}$O$_6$ + O$_2$

$$6\text{CO}_2\text{(g)} + 6\text{H}_2\text{O(l)} \rightarrow \text{C}_6\text{H}_{12}\text{O}_6\text{(aq)} + 6\text{O}_2\text{(g)}$$

18. Pb(NO$_3$)$_2$ $\rightarrow$ PbO + NO$_2$ + O$_2$

$$2\text{Pb(NO}_3)_2\text{(s)} \rightarrow 2\text{PbO(s)} + 4\text{NO}_2\text{(g)} + \text{O}_2\text{(g)}$$

19. CH$_4$ + O$_2$ $\rightarrow$ CO$_2$ + H$_2$O

$$\text{CH}_4\text{(g)} + 2\text{O}_2\text{(g)} \rightarrow \text{CO}_2\text{(g)} + 2\text{H}_2\text{O(g)}$$

20. NO$_2$ + H$_2$O $\rightarrow$ HNO$_2$ + HNO$_3$

$$2\text{NO}_2\text{(g)} + \text{H}_2\text{O(l)} \rightarrow \text{HNO}_2\text{(aq)} + \text{HNO}_3\text{(aq)}$$

21. Li$_2$O + H$_2$O $\rightarrow$ LiOH

$$\text{Li}_2\text{O(s)} + \text{H}_2\text{O(l)} \rightarrow 2\text{LiOH(aq)}$$