Multiple Choice
At standard temperature and pressure (STP), what is the volume occupied by 2 mol of chlorine gas (Cl_2)?
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7. Gases
Standard Temperature and Pressure
Multiple Choice
Which of the following sets of conditions corresponds to standard temperature and pressure (STP)?
A
30 °C and 1 atm
B
0 °C and 2 atm
C
25 °C and 1 atm
D
0 °C and 1 atm
Verified step by step guidance1
Understand the definition of standard temperature and pressure (STP). STP is commonly defined as a temperature of 0 °C (which is 273.15 K) and a pressure of 1 atm.
Convert the given temperatures to Kelvin if needed, since temperature in gas law calculations is always in Kelvin. For example, 0 °C = 273.15 K, 25 °C = 298.15 K, and 30 °C = 303.15 K.
Compare each set of conditions to the STP definition: check if the temperature is 0 °C (273.15 K) and the pressure is 1 atm.
Evaluate each option: 30 °C and 1 atm (temperature too high), 0 °C and 2 atm (pressure too high), 25 °C and 1 atm (temperature too high), and 0 °C and 1 atm (matches STP exactly).
Conclude that the set of conditions matching STP is 0 °C and 1 atm, because both temperature and pressure meet the standard values.
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