# Questions tagged [enthalpy]

A thermodynamic state function describing the total energy content of a system.

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### Calorimetry, finding final temperature

I was looking for some help on understanding this practice question from my text book, I know how to figure out enthalpy, but this is my first temperature change question and I am stumped. Any ...
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### Can the enthalpy change of a reaction be changed, and if so, will this affect the value of the equilibrium constant?

In the case of an arbitrary equilibrium reaction, is it possible to change the absolute enthalpy of the final products, thus the reaction enthalpy change? For example, say pH affects the charge ...
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### Reaction enthalpy [closed]

In an experiment, we measured the temperature difference in a reaction of $2.5\ \mathrm g$ of $\ce{Na2SO3}$ with $25\ \mathrm{ml}$ of $10{-}13\ \%$ $\ce{NaClO}$ in a calorimeter with $300\ \mathrm{ml}$...
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### Enthalpy of solution

If NaCl dissolves in water, it is said that it happens because the hydration energy is greater than the lattice energy. If so, the enthalpy of solution attained is about +3.88kJ/mol, implying that it ...
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### Why are condensation reactions endergonic?

My lecture notes state that Condensation reactions, like all biosynthetic reactions, are endergonic. I am unsure as to why this would be the case. I thought bond formation was an exothermic ...
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### Can a reaction of the form A + B → AB ever be endothermic? [duplicate]

I understand that forming a bond between $\ce{A}$ and $\ce{B}$ is an exothermic process, with negative enthalpy, but won't there be energy required to get $\ce{A}$ and $\ce{B}$ close enough together ...
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### Enthalpy Change Of Formation

Enthalpy change of formation means the heat change when 1 mol of the compound is formed from its elements under standard condition. For example, the enthalpy change for the formation of carbon dioxide ...
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### How to find the temperature change of a solution?

Right now I'm doing a calorimetry lab and for the pre-lab we have been asked to determine the temperature change (in Celsius) of ammonium chloride in water. The question asks for the expected ...