Multiple Choice
At standard temperature and pressure (STP), which statement is true about 1.00 mol samples of H2(g) and N2(g)?
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7. Gases
Standard Temperature and Pressure
Multiple Choice
Under standard conditions (298 K and 1 atm), which statement is true?
A
Standard conditions refer to 0°C and 1 atm.
B
The standard temperature is 273 K.
C
One mole of an ideal gas occupies approximately 24.8 L.
D
Standard pressure is defined as 2 atm.
Verified step by step guidance1
Understand the definitions of standard conditions and standard temperature and pressure (STP). Standard conditions often refer to 25°C (298 K) and 1 atm, while STP is defined as 0°C (273 K) and 1 atm.
Recall the ideal gas law: \(P V = n R T\), where \(P\) is pressure, \(V\) is volume, \(n\) is moles, \(R\) is the ideal gas constant, and \(T\) is temperature in Kelvin.
Calculate the molar volume of an ideal gas at standard conditions (298 K and 1 atm) by rearranging the ideal gas law to \(V = \frac{n R T}{P}\). For one mole (\(n=1\)), plug in the values of \(R\), \(T=298\) K, and \(P=1\) atm.
Compare the calculated molar volume to the given values (such as 24.8 L) to verify which statement about the volume of one mole of an ideal gas is true under standard conditions.
Review the definitions of standard pressure and temperature to confirm or refute the statements about standard pressure being 2 atm and standard temperature being 273 K.
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