Problem- in both reaction #a and reaction #b, the dissolved hygrogen chloride in the hydrochloric acid solution is part of the system. Why is this?
RXN#a- Mg(s) + 2 HCl (aq) --> MgCl2(aq) +H2(g)
RXN#b- MgO(s) + 2HCl(aq) --> MgCl2(aq) +H2O(l)
Please provide the balanced reaction.