Multiple Choice
Which of the following samples will have the greatest volume at standard temperature and pressure (STP)?
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7. Gases
Standard Temperature and Pressure
Multiple Choice
Which of the following gases, when measured at standard temperature and pressure (STP), would occupy the greatest volume if 1 mole of each is considered?
A
All gases listed would occupy the same volume at STP
B
Oxygen (O_2)
C
Carbon dioxide (CO_2)
D
Hydrogen (H_2)
Verified step by step guidance1
Recall the definition of standard temperature and pressure (STP), which is 0°C (273.15 K) and 1 atm pressure.
Understand that at STP, one mole of any ideal gas occupies the same volume, known as the molar volume of a gas.
The molar volume of an ideal gas at STP is approximately 22.4 liters per mole.
Since oxygen (O_2), carbon dioxide (CO_2), and hydrogen (H_2) are all gases and can be approximated as ideal gases under these conditions, 1 mole of each will occupy the same volume.
Therefore, the volume occupied by 1 mole of each gas at STP is equal, regardless of their molecular weights or identities.
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