Multiple Choice
A gas mixture contains 2.0 mol of N_2 and 3.0 mol of O_2. What is the mole fraction of N_2 in the mixture?
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2. Atoms & Elements
Mole Concept
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Avogadro's law states that at a given temperature and pressure:
A
Equal volumes of different gases contain the same number of molecules.
B
Equal volumes of different gases have the same mass.
C
Equal numbers of moles of different gases have different volumes.
D
Equal masses of different gases occupy the same volume.
Verified step by step guidance1
Understand that Avogadro's law relates the volume of a gas to the number of moles (or molecules) when temperature and pressure are held constant.
Recall the statement of Avogadro's law: \(V \propto n\) at constant temperature and pressure, where \(V\) is volume and \(n\) is the number of moles.
Interpret this to mean that equal volumes of different gases, measured under the same conditions of temperature and pressure, contain the same number of molecules (or moles).
Recognize that this does not imply equal masses or equal volumes for equal masses, since different gases have different molar masses.
Conclude that the correct understanding of Avogadro's law is: 'Equal volumes of different gases contain the same number of molecules.'
