What are standard conditions?

Question

For example, in the equation #\Delta G^{\circ} = \Delta H^{\circ} - T\Delta S^{\circ}#,
#\Delta G^{\circ}# seems to be temperature dependent, so does that mean #\Delta G^{\circ}# only applies at a specific pressure?

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Answer 1 · 2018-01-04T03:38:56

See Below.

Examples of standard conditions are Standard Temperature, Standard Pressure, or STP (Standard Temperature and Pressure).

At STP,

Temperature = 273.15K,
Pressure = 1 atm (before 1982)
Pressure = 1 bar (after 1982)

Also, at STP,

1 mol of IDEAL gas = 22.414 L at 1 atm
1 mol of IDEAL gas = 22.711 L at 1 bar

This is not to be confused with thermodynamic standard conditions, which is what you are looking for. It is similar, but

Temperature = 298.15K,
Pressure = 1 atm (before 1982)
Pressure = 1 bar (after 1982)