Standard thermodynamic conditions chosen for substance when listing or comparing thermodynamic data refer to

Options

A. one atmosphere pressure and `273 K`
B. one bar pressure and any specified temperature
C. one atmosphere pressure and `298 K`
D. one bar pressure and 298 K

Answer

B

Explanation

For the ease of comparison and tabulation, we refer to thermochemical or thermodynamic changes under standard conditions. To indicate a change at standard pressure (1 bar pressure), we add a superscript zero. If some temperature other than `25^(@)C` (298 K) is specified, we indicate it with a subscript, e.g., `Delta H^(@)` (300 K). If no subscript appears, a temperature of `25^(@)C` (298 K) is limplied.