翻訳と辞書 Words near each other ・ Mole (espionage) ・ Mole (surname) ・ Mole (unit) ・ Mole (Zdeněk Miler character) ・ Mole Antonelliana ・ Mole Attack ・ Mole Baby ・ Mole Beach ・ Mole blanco ・ Mole City ・ Mole Creek ・ Mole Creek Karst National Park ・ Mole cricket ・ Mole Day ・ Mole de olla ・ Mole fraction ・ Mole Gap to Reigate Escarpment ・ Mole Gap Trail ・ Mole Harbor Shelter Cabin ・ Mole Hill (Virginia) ・ Mole hole ・ Mole Hunt ・ Mole Kart ・ Mole Lake ・ Mole Lake, Wisconsin ・ Mole Listening Pearls ・ Mole Man ・ Mole Mania ・ Mole map ・ Mole map (chemistry) Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Mole fraction ： ウィキペディア英語版 Mole fraction In chemistry, the mole fraction or molar fraction ($x\_i$) is defined as the amount of a constituent (expressed in moles), $n\_i$, divided by the total amount of all constituents in a mixture, $n\_$: :$x\_i\; =\; \backslash frac^\; n\_i\; =\; n\_\; ;\; \backslash ;\; \backslash sum\_^\; x\_i\; =\; 1$ The same concept expressed with a denominator of 100 is the mole percent or molar percentage or molar proportion (mol%). The mole fraction is also called the amount fraction.〔 It is identical to the number fraction, which is defined as the number of molecules of a constituent $N\_i$ divided by the total number of all molecules $N\_$. The mole fraction is sometimes denoted by the lowercase Greek letter ''$\backslash chi$'' (''chi'') instead of a Roman $x$. For mixtures of gases, IUPAC recommends the letter $y$.〔 The National Institute of Standards and Technology of the United States prefers the term amount-of-substance fraction over mole fraction because it does not contain the name of the unit mole. Whereas mole fraction is a ratio of moles to moles, molar concentration is a ratio of moles to volume. The mole fraction is one way of expressing the composition of a mixture with a dimensionless quantity; mass fraction (percentage by weight, wt%) and volume fraction (percentage by volume, vol%) are others. ==Properties== Mole fraction is used very frequently in the construction of phase diagrams. It has a number of advantages: * it is not temperature dependent (such as molar concentration) and does not require knowledge of the densities of the phase(s) involved * a mixture of known mole fraction can be prepared by weighing off the appropriate masses of the constituents * the measure is ''symmetric'': in the mole fractions x=0.1 and x=0.9, the roles of 'solvent' and 'solute' are reversed. * In a mixture of ideal gases, the mole fraction can be expressed as the ratio of partial pressure to total pressure of the mixture 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mole fraction」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.