H= aC+ b what does this mean?

If a solution had a ph of 7 what is the solution

At which temperature would a reaction with ah= -220 kj/mol and as=-0.05 kj/(mol-k) be spontaneous?

What type of reaction is shown below? check all that apply. agno3(aq) + nacl(aq) → nano3(aq) + agcl(s) i synthesis decomposition combustion i single replacement double replacement done