15. Balance the following equations :
(a) CaCO3 (s) + HCl (aq) → CaCl2 (aq) + H2O (1) + CO2(g)
(b) Zn (s) + HCl (aq) → ZnCl2 (aq) + H2(g)
(c) MnO2(s) + HCl (aq) → MnCl2(aq) + H2O (1) + Cl2 (g)
(d) Na CO2 (s) + H2SO4 (aq) → Na2SO4 (aq) + H2O (1) + CO2 (g)
(e) Mg3N2 (s) + H2O (1) ► Mg(OH)2 (s) + NH, (g)
(f) NH; (g) + O2(g) → N, (g) + H2O (1)
(g) MgCl2 (aq) + Na CO2 (aq) → MgCO2 (s) + NaCl (aq)
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(a) Zn(s)+2HCl(aq)→ZnCl
2
(aq)+H
2
(g)
(b) Na
2
CO
3
(s)+2HCl(aq)→2NaCl(s)+CO
2
(g)+H
2
O(l)
(c) NaHCO
3
(s)+HCl(aq)→NaCl(aq)+CO
2
(g)+H
2
O(l)
(d) NaOH(aq)+HCl(aq)→NaCl(aq)+H
2
O(l)
(e) CuO(s)+2HCl(aq)→CuCl
2
(aq)+H
2
O(l)
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