2. (a) Given the following equations and H0rxn at 250C

Question

H3BO3(aq) �¨ HBO2(aq) + H2O(l) ∆H0rxn = -0.02kJ
H2B4 O7(s) + H2O(l) �¨ 4HBO2(aq) ∆H0rxn = -11.3kJ
H2B4O7(s) �¨ 2B2O3(s) + H2O(l) ∆H0rxn = +17.5kJ
(i) Calculate ∆H0rxn for the reaction 2H3BO3(aq) �¨ 2B2O3(s) + H2O(l)
(ii) How does your calculation above illustrate Hess�fs law of heat summation?

Answer 1

See your previous post. All of these are done the same way more or less.