Standard temperature and pressure are defined as
- A. 25 degrees Celsius and 1 atm
- B. 0 degrees Celsius and 1 atm
- C. 0 K and 1 atm
- D. 100 degrees Celsius and 1 atm
Explanation
STP is 273.15 K, that is 0 degrees Celsius, at one atmosphere, and it is under these conditions that a mole of gas occupies 22.4 dm3. Room temperature and pressure, at 25 degrees, is a different reference where the molar volume is about 24 dm3. Quoting the wrong reference changes every subsequent calculation.