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Ch.10 - Gases
Brown - Chemistry: The Central Science 14th Edition
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Brown 14th EditionCh.10 - Gases문제 113g
10장, 문제 113g

Consider the following gases, all at STP: Ne, SF6, N2, CH4. (g) Which one would have the largest van der Waals b parameter?

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1
Understand that the van der Waals b parameter is related to the volume occupied by the gas molecules themselves. It is larger for gases with larger or more complex molecules.
Identify the molecular weights and structures of the given gases: Ne (Neon), SF_6 (Sulfur hexafluoride), N_2 (Nitrogen), and CH_4 (Methane).
Recognize that SF_6 is a larger and more complex molecule compared to Ne, N_2, and CH_4, due to its six fluorine atoms surrounding a sulfur atom.
Recall that the van der Waals b parameter increases with the size and complexity of the molecule, as larger molecules occupy more space.
Conclude that SF_6, being the largest and most complex molecule among the given gases, would have the largest van der Waals b parameter.

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주요 개념

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Van der Waals Forces

Van der Waals forces are weak intermolecular forces that arise from temporary dipoles in molecules. These forces include attractions between neutral molecules and are significant in understanding the behavior of gases and liquids. The strength of these forces can influence properties such as boiling points and solubility.
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Van der Waals Equation

Van der Waals b Parameter

The Van der Waals b parameter represents the volume occupied by one mole of a gas at a given temperature and pressure, accounting for the finite size of gas molecules. A larger b value indicates that the molecules are larger or more complex, leading to greater repulsive interactions. This parameter is crucial for understanding deviations from ideal gas behavior.
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가이드 코스
01:40
Van der Waals Equation

STP Conditions

Standard Temperature and Pressure (STP) refers to a set of conditions commonly used in chemistry, defined as 0 degrees Celsius (273.15 K) and 1 atmosphere of pressure. Under these conditions, the behavior of gases can be compared more easily, and properties such as molar volume can be standardized, aiding in the analysis of different gases.
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02:20
STP Calculation Example
관련 실천
교과서 질문
It turns out that the van der Waals constant b equals four times the total volume actually occupied by the molecules of a mole of gas. Using this figure, calculate the fraction of the volume in a container actually occupied by Ar atoms (b) at 20.27 MPa pressure and 0 °C. (Assume for simplicity that the ideal-gas equation still holds.)
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교과서 질문

Consider the following gases, all at STP: Ne, SF6, N2, CH4. (d) Which one has the highest total molecular volume relative to the space occupied by the gas?

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교과서 질문

Consider the following gases, all at STP: Ne, SF6, N2, CH4. (a) Which gas is most likely to depart from the assumption of the kinetic-molecular theory that says there are no attractive or repulsive forces between molecules?

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교과서 질문

Consider the following gases, all at STP: Ne, SF6, N2, CH4. (f) Which one would effuse more rapidly than N2?

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