Multiple Choice
Which of the following represents the correct mass-volume relationship for one mole of an ideal gas at standard temperature and pressure (STP)?
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7. Gases
Standard Temperature and Pressure
Multiple Choice
Which of the following best describes the term 'standard conditions' (Standard Temperature and Pressure, STP) in chemistry?
A
A temperature of 0^ext{o}C (273.15 K) and a pressure of 1 bar
B
A temperature of 25^ext{o}C (298.15 K) and a pressure of 1 bar
C
A temperature of 0^ext{o}C (273.15 K) and a pressure of 1 atm
D
A temperature of 25^ext{o}C (298.15 K) and a pressure of 1 atm
Verified step by step guidance1
Understand that 'standard conditions' or Standard Temperature and Pressure (STP) in chemistry refer to a specific set of temperature and pressure values used as a reference point for experiments and calculations.
Recall that historically, STP has been defined as a temperature of 0^\(\text{o}\)C (273.15 K) and a pressure of 1 atm (atmosphere). This is the most commonly accepted definition in many chemistry contexts.
Note that 1 atm is equivalent to 101.325 kPa, and sometimes pressure is given in bars; 1 bar is slightly less than 1 atm (1 bar = 100 kPa). This distinction is important because some sources define standard pressure as 1 bar instead of 1 atm.
Recognize that the temperature of 25^\(\text{o}\)C (298.15 K) and pressure of 1 atm or 1 bar is often referred to as 'standard ambient temperature and pressure' (SATP), which is different from STP.
Therefore, the best description of STP is the set of conditions with temperature 0^\(\text{o}\)C (273.15 K) and pressure 1 atm, which matches the classical definition used in many chemistry calculations.
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