Multiple Choice
Which of the following samples at standard temperature and pressure (STP) has the same chemical properties as 10 grams of Al(s) at STP?
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7. Gases
Standard Temperature and Pressure
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Which of the following represents the correct mass-volume relationship for one mole of an ideal gas at standard temperature and pressure (STP)?
A
22.4 L of gas has a mass of 1 g
B
22.4 L of gas has a mass equal to its molar mass
C
1 L of gas has a mass equal to its molar mass
D
1 mol of gas occupies 1 L at STP
Verified step by step guidance1
Recall that at standard temperature and pressure (STP), one mole of an ideal gas occupies a volume of 22.4 liters. This is a fundamental concept in gas laws.
Understand that the mass of one mole of a gas is equal to its molar mass, which is the mass of one mole of that substance expressed in grams.
Combine these two ideas: since one mole of gas occupies 22.4 L at STP, the mass of 22.4 L of gas must be equal to the molar mass of that gas.
Evaluate the given options by comparing them to this relationship: the volume of 22.4 L corresponds to one mole, and the mass of that volume corresponds to the molar mass.
Conclude that the correct mass-volume relationship is: '22.4 L of gas has a mass equal to its molar mass' because it correctly links the molar volume at STP with the molar mass.
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