Molecular Volume
Molecular Volume - Related Videos
04:01
Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation
0 Views •
2020
Thus far, the ideal gas law, PV = nRT, has been applied to a variety of different types of problems, ranging from reaction stoichiometry and empirical and molecular formula problems to determining the density and molar mass of a gas. However, the behavior of a gas is often non-ideal, meaning that the observed relationships between its pressure, volume, and temperature are not accurately described by the gas laws. According to kinetic molecular theory, particles of an ideal gas do not exhibit...
08:51
Understanding Concentration and Measuring Volumes
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2023
Solutions are utilized to some degree in almost all biological research applications. Therefore understanding how to measure and manipulate them is imperative to any experiment. In this video, concepts in preparing solutions are introduced. Solutions consist of a solute dissolved in solvent to yield a homogeneous mixture of molecular substances. Solutions are generally identified by their components and corresponding concentrations. Concentrated solutions are diluted through various...
09:55
Molecular Cloning
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2023
Molecular cloning is a set of methods, which are used to insert recombinant DNA into a vector - a carrier of DNA molecules that will replicate recombinant DNA fragments in host organisms. The DNA fragment, which may be a gene, can be isolated from a prokaryotic or eukaryotic specimen. Following isolation of the fragment of interest, or insert, both the vector and insert must be cut with restriction enzymes and purified. The purified pieces are joined together though a technique called...
06:54
MR Molecular Imaging of Prostate Cancer with a Small Molecular CLT1 Peptide Targeted Contrast Agent
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Cited by 3 •
2013
To demonstrate MR cancer molecular imaging with a small peptide targeted MRI contrast agent specific to clotted plasma proteins in tumor stroma in a mouse prostate cancer model.
02:41
Constant Volume Calorimetry
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2020
Calorimeters are useful to determine the heat released or absorbed by a chemical reaction. Coffee cup calorimeters are designed to operate at constant (atmospheric) pressure and are convenient to measure heat flow (or enthalpy change) accompanying processes that occur in solution at constant pressure. A different type of calorimeter that operates at constant volume, colloquially known as a bomb calorimeter, is used to measure the energy produced by reactions that yield large amounts of heat and...
FAQs
A structural estimate starts with the molecule’s dimensions and an appropriate geometric description of its shape. The resulting value approximates the space associated with one molecule rather than measuring the entire sample directly. This approach is useful when molecular geometry is known and provides a microscopic basis for interpreting bulk properties such as density and packing.
Real gas particles occupy finite space, so not all of a container’s volume is freely available for molecular motion. Intermolecular interactions also affect how particles behave. Accounting for these effects through an effective molecular volume helps explain why measured gases can depart from predictions made by the ideal-gas model.
Molecular volume connects the amount of space associated with individual molecules to how matter is arranged in a bulk sample. Comparing molecular size with the sample’s volume helps physicists analyze density and packing, particularly in liquids and solids. Changes in packing can also provide insight into phase behavior, where molecular organization differs between states of matter.
A geometric estimate is based primarily on a molecule’s dimensions and shape. In a gas, an effective volume can additionally represent space excluded because particles have finite size and experience intermolecular interactions. These descriptions address related but different aspects of molecular space, making the effective value especially relevant when interpreting deviations from ideal-gas behavior.
Divide the substance’s molar volume by Avogadro’s constant to obtain a per-molecule estimate. This calculation translates a macroscopic quantity, measured for one mole of material, into a microscopic scale. The result can then be compared with estimates based on molecular dimensions, helping connect measurable bulk behavior with molecular structure.
The concept is useful when linking microscopic structure to equations of state and other descriptions of bulk materials. It supports analysis of density, molecular packing, and phase behavior in liquids and solids, while effective volume helps interpret real gases. These applications make molecular volume a bridge between molecular-scale geometry and measurable properties of matter.