Select the incorrect statement

The correct option is: "At room temperature, the heat of combustion is not found".

Let us break down the thermodynamic principles to understand why this statement is incorrect:
1. Definition of Heat of Combustion: The heat of combustion (or enthalpy of combustion) is the amount of heat energy released when one mole of a substance undergoes complete combustion with oxygen under standard conditions.
2. Standard Reference Temperature: In thermodynamics, the standard state temperature for measuring thermochemical data, including the heat of combustion, is typically defined at 298.15 K (which corresponds to 25 °C, or standard room temperature) and a pressure of 1 bar.
3. Availability of Data: The heat of combustion for a wide variety of fuels, hydrocarbons, and organic compounds is experimentally determined and widely tabulated specifically at this standard room temperature (298.15 K). Therefore, stating that the heat of combustion is "not found" at room temperature is factually incorrect.

Let us also look at the other statements for context:
- The triple point of water is indeed a primary reference point on the thermodynamic scale of temperature, defined at exactly 273.16 K.
- By definition of the kelvin, 1 K is equal to 1/273.16 of the thermodynamic temperature of the triple point of water.