ThermochemistryHard

Question

From the following data, mark the option(s) where ᐃH is correctly written for the given reaction.
Given : H+ (aq) + OH- (aq) → H2O(l); ᐃH = - 57.3 kJ
            ᐃHsolution of HA(g) = - 70.7 kJ/mol
            ᐃHsolution of BOH(g) = 20 kJ/mol
ᐃHionization of HA = 15 kJ/mol and BOH is a strong base.

Options

A.Reaction → HA(aq) + BOH(aq) → BA(aq) + H2O
ᐃHr (kJ/mol) → -42.3
B.Reaction → HA(g) + BOH(g) → BA(aq) + H2O
ᐃHr (kJ/mol) → -93
C.Reaction → HA(g) → H+(aq) + A- (aq)
ᐃHr (kJ/mol) → -55.7
D.Reaction → B+(aq) + OH- (aq) → BOH(aq)
ᐃHr (kJ/mol) → -20

Solution

BOH (g) + aqueous →  B+ (aq) + OH-(aq)     ᐃH = -20 kJ/mole

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