Question

Write the thermochemical equation for the reaction between one mole of nitrogen oxide (NO) and oxygen (O2) to give the brown gas NO2. When one mole of NO reacts with oxygen, 57.0 kJ of heat is evolved.

Answer 1

The thermochemical equation for the reaction between one mole of nitrogen oxide (NO) and oxygen (O2) to form NO2 is 2NO(g) + O2(g) → 2NO2(g). The reaction is exothermic, with an enthalpy change of -57.0 kJ/mol.

Step-by-step explanation:

The thermochemical equation for the reaction between one mole of nitrogen oxide (NO) and oxygen (O2) to give the brown gas NO2 can be written as:

2NO(g) + O2(g) → 2NO2(g)

This reaction is exothermic, meaning that heat is evolved. The enthalpy change for this reaction is -57.0 kJ/mol, meaning that 57.0 kJ of heat is released when one mole of NO reacts with oxygen.

Thermochemistry is the study of the heat energy which is associated with chemical reactions and/or phase changes such as melting and boiling. A reaction may release or absorb energy, and a phase change may do the same.

Thermochemistry focuses on the energy exchange between a system and its surroundings in the form of heat. Thermochemistry is useful in predicting reactant and product quantities throughout the course of a given reaction. In combination with entropy determinations, it is also used to predict whether a reaction is spontaneous or non-spontaneous, favorable or unfavorable.