Multiple Choice
At standard temperature and pressure (STP), which gas sample contains the same number of molecules as 2.0 liters of CH_4(g) at STP?
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7. Gases
Standard Temperature and Pressure
Multiple Choice
Compared with 1 mole of hydrogen gas at standard temperature and pressure (STP), 1 mole of argon gas at STP occupies:
A
a greater volume
B
the same volume
C
a smaller volume
D
a variable volume depending on the molar mass
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, which is approximately 22.4 liters.
Recognize that both hydrogen gas (H\_2) and argon gas (Ar) behave approximately as ideal gases under these conditions.
Apply the ideal gas law formula: \(PV = nRT\), where \(P\) is pressure, \(V\) is volume, \(n\) is moles, \(R\) is the gas constant, and \(T\) is temperature.
Since \(P\), \(n\), \(R\), and \(T\) are the same for both gases at STP, the volume \(V\) must be the same for 1 mole of hydrogen gas and 1 mole of argon gas.
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