The Enthalpy Change for a Reaction Can Be Calculated Using $\circ$

question 13

Essay

The enthalpy change for a reaction can be calculated using the equation
DH°_rxn It would be possible to use DS ^$\circ$ _f values to calculate DS ^$\circ$ _rxn in a similar manner; however, this is not done in practice.
a. Describe the procedure which is used instead.
b. Explain why this mathematical process is possible for entropy calculations but not for enthalpy calculations.

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Definitions:

Income Statement

A financial statement that reports a company's financial performance over a specific accounting period, detailing revenues and expenses.

Expenses

Outflows or depletions of assets or incurrences of liabilities during a period as a result of delivering or producing goods, rendering services, or carrying out other activities linked to an entity's main operations.

Variable Costing

A costing method where variable manufacturing costs are treated as product costs, and fixed manufacturing overhead is treated as a period cost.

Net Income

The amount of earnings left after all expenses, including taxes and costs, have been subtracted from total revenue.