Using data in Appendix 4, calculate ΔH^- for the reaction 2 NO(g)+O2(g) →2 NO2(g)

Name: Problem 21, Chapter 13: Chemistry: An Atoms-Focused Approach
Uploaded: 2020-07-28T19:39:14-08:00
Duration: 2 min 13 s
Channel: Matthew Glaub
Description: Using data in Appendix 4, calculate ΔH^- for the reaction 2 NO(g)+O2(g) →2 NO2(g)

step 1 All right, so the question is going to ask us about calculating enthalpy. So in order to do so,

Using data in Appendix 4, calculate ΔH^- for the reaction 2...

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Key Concepts

Stoichiometry in Thermochemical Calculations

Stoichiometry is essential in thermochemical calculations as it involves using the balanced chemical equation to account for the proportions of reactants and products. Correctly applying the stoichiometric coefficients when summing the individual enthalpy changes ensures the accurate calculation of the overall reaction enthalpy.

Standard Enthalpy of Formation

The standard enthalpy of formation is the heat change that occurs when one mole of a compound is formed from its elements in their standard states. It serves as a reference value that allows the calculation of reaction enthalpies using tabulated data from standard reference materials.

Hess's Law

Hess's Law states that the overall enthalpy change for a chemical reaction is the same regardless of whether the reaction occurs in one step or several steps. This principle allows the use of standard enthalpies of formation to compute the enthalpy change for complex reactions by subtracting the sum of the reactants’ formation enthalpies from that of the products.

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