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Common Properties of Chemicals of Concern and Soil Matrices
Published in Cristiane Q. Surbeck, Jeff Kuo, Site Assessment and Remediation for Environmental Engineers, 2021
Cristiane Q. Surbeck, Jeff Kuo
In chemistry, mole refers to g-mole. For example, one mole of water (H2O) has a molar mass of 18 grams, or 18 g/mol. However, in engineering practice, kg-mole and lb-mole are also commonly used. One kg-mole of water has a mass of 18 kilograms, or 18 kg/kmol, while one lb-mole of water has a mass of 18 pounds.
Particulates and Gases
Published in W. David Yates, Safety Professional’s Reference and Study Guide, 2020
As described above, a mole is an SI unit, which describes the atomic weight in terms of grams per mole. When we weigh 1 mol of a substance on a balance, this is called a molar mass (MM) and has the unit grams per mole. This idea is critical as it will be used throughout this chapter and in the course of your professional career. An example of this is as follows:
Linear and Nonlinear Models of Fuel Cell Dynamics
Published in Gou Bei, Ki Na Woon, Diong Bill, Fuel Cells, 2017
Gou Bei, Ki Na Woon, Diong Bill
where MH2O is the water molar mass, 18.02 g/mol. All units of flow rates, usage, and the production of gases are defined in mol/s. However, because the liquid water is considered based on our assumption that each relative humidity stays over 100%, βa or c will be 1, which means that pH2OA or C > Pvs during the simulation. Va and Vc are the anode and cathode volumes, respectively, and their units are m3. According to the basic electrochemical relationships, the usage and production of the gases are functions of the cell current density Ifc [4], as follows: H2 used=2 O2 used=H2OCproduced=N⋅Afc⋅Ifc2F
Experimental study on formation characteristics of carbon dioxide hydrate in frozen porous media
Published in International Journal of Green Energy, 2021
Xuemin Zhang, Jinping Li, Jiaxian Wang, Qingbai Wu, Yingmei Wang, Ze Yao
In the above equation, it is determined that the hydration number is 6.15 in the experimental conditions (Hwang et al. 1990). The number 18 represents the water molar mass. Meanwhile, mw, 0 is the mass of water at the initial stage during the experiment.