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What are the standard temperature and pressure conditions enthalpy is usually measured under?

What are the standard temperature and pressure conditions enthalpy is usually measured under class=

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Answer: Until 1982, STP was defined as a temperature of 273.15 K (0 °C, 32 °F) and an absolute pressure of exactly 1 atm (101.325 kPa). Since 1982, STP is defined as a temperature of 273.15 K (0 °C, 32 °F) and an absolute pressure of exactly 105 Pa (100 kPa, 1 bar).

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The correct answer is D: 100kPa and 298 K.

The enthalpy of a system is a thermodynamic quantity which can be regarded as the total energy content of the system.

The enthalpy of a system is measured under standard conditions. The standard conditions include;

  • 100kPa
  • 298 K
  • 1 M (for aqueous solutions)

Hence, the standard temperature and pressure conditions enthalpy is usually measured under are 100kPa and 298 K.

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