# Problem: What is ΔHrxn at 25C?ΔHf ° (H+) = 0.0 kJ/mol;ΔHf ° (OH-) = -230.0 kJ/mol;ΔHf ° (H2O) = -285.8 kJ/mol)H+ (aq) + OH- (aq) → H2O (l)A. -55.8 J/mol B. 53.3 J/mol C. -55.8 kJ/mol D. -60.0 kJ/mol E. 55.8 kJ/mol

###### FREE Expert Solution

We are asked what is ΔHrxn at 25°C for :

H+ (aq) + OH- (aq) → H2O (l)

Recall that ΔH˚rxn can be calculated from the enthalpy of formation (ΔH˚f) of the reactants and products involved:

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###### Problem Details

What is ΔHrxn at 25C?

ΔHf ° (H+) = 0.0 kJ/mol;

ΔHf ° (OH-) = -230.0 kJ/mol;

ΔHf ° (H2O) = -285.8 kJ/mol)

H+ (aq) + OH- (aq) → H2O (l)

A. -55.8 J/mol

B. 53.3 J/mol

C. -55.8 kJ/mol

D. -60.0 kJ/mol

E. 55.8 kJ/mol

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Enthalpy of Formation concept. You can view video lessons to learn Enthalpy of Formation. Or if you need more Enthalpy of Formation practice, you can also practice Enthalpy of Formation practice problems.