Standard temperature and pressure (STP) is defined as
Correct answer: B. 0 degrees C and 1 atm
- A. 25 degrees C and 1 atm
- B. 0 degrees C and 1 atm
- C. 0 K and 1 atm
- D. 25 degrees C and 760 mm of mercury above atmospheric
Explanation
STP is 273.15 K, which is 0 degrees Celsius, at a pressure of 1 atmosphere or 760 mm of mercury. One mole of any ideal gas occupies 22.4 dm3 under these conditions, which is the molar volume used throughout stoichiometry. The value of 25 degrees Celsius belongs to standard state conditions used in thermochemistry, a different convention.
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About Standard Temperature and Pressure
Standard temperature and pressure provide reference conditions for gas calculations: 0°C or 273 K and, in the usual school convention, 1 atm pressure. Questions use these conditions to relate pressure, volume, temperature and amount of gas, including the molar volume of an ideal gas, about 22.4 dm³.
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