Endothermic Reaction and Enthalpy Change

Easy General Chemistry Thermodynamics And Thermochemistry

In a given endothermic reaction, heat is absorbed from the surroundings. This process leads to a decrease in the temperature of the surrounding environment. Thermodynamic principles help us understand how energy is transformed during chemical reactions. In an endothermic reaction at constant pressure, the change in enthalpy (ΔH) is positive, indicating that the products have higher energy than the reactants. Consider the following reaction where solid ammonium nitrate (NH₄NO₃) dissolves in water:

NH₄NO₃ (s) + H₂O (l) → NH₄NO₃ (aq) + heat

If the enthalpy of dissolution for this process is +26.2 kJ/mol, which of the following statements about the thermodynamics of this reaction is true?

The reaction releases heat and has a negative enthalpy change.

The reaction absorbs heat and has a positive enthalpy change.

The reaction is exothermic due to an increase in system energy.

No heat is exchanged with the surroundings during the reaction.

Hint

Submitted4.0K

Correct3.3K

% Correct83%