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Chapter 6: Problem 39

What is meant by the standard-state condition?

Short Answer

Expert verified
The standard-state condition is a reference point used in thermochemistry for the purpose of calculating properties such as enthalpy, entropy, Gibbs energy. It's usually a pure substance at 1 bar pressure, often with the temperature being 298.15K (25掳C). For gases, it's the pure gas at exactly 1 bar, and for a substance in a solution, it's a 1M concentration.

Step by step solution

01

Define Standard-State Condition

The standard-state condition refers to a reference base employed for the calculation of altering properties like enthalpy, entropy and Gibbs energy. These thermochemical measurements have their reference point defined as the standard state which is the pure substance at 1 bar pressure, typically at 298.15K (25掳C). The standard states for gases is the pure gas at exactly 1 bar. For a substance in a solution, the standard state is a 1M concentration. Each of these standard states shares the definition of having an activity equal to one.

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