Feb 17, 2016 12:09
8 yrs ago
1 viewer *
Chinese term
质量分数
Chinese to English
Science
Chemistry; Chem Sci/Eng
将5种壬二酸氨基酸衍生物 配制成质量分数分别为 0.5%, 1%, 5%, 10% 的水溶液.
Proposed translations
(English)
| 5 +1 | mass fraction |
Linda Yang
|
| 4 +1 | Percentage by mass |
jingmlittlej (X)
|
| 5 | weight percent |
jyuan_us
|
Proposed translations
+1
1 day 9 mins
Linda Yang
Native in Chinese
Facts speak louder than words.
Native in: Chinese 
Works in: English to Chinese, German to Chinese
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+1
4 hrs
Percentage by mass
OR mass fraction. https://en.wikipedia.org/wiki/Mass_fraction_(chemistry)
http://baike.baidu.com/link?url=IaylXf9IDX0aZABtu_GShubUWLtb...
http://baike.baidu.com/link?url=IaylXf9IDX0aZABtu_GShubUWLtb...
Peer comment(s):
| agree |
ysun
: 在你提出的两个答案 "Percentage by mass OR mass fraction" 中，我倾向于 mass fraction，不过 percentage by mass 也可接受。你提供的 Wikipedia 网页已经说得很清楚，"Mass fraction can also be expressed … as percentage by mass"。原文中的质量分数显然就是以 "percentage by mass" 表示的。
4 days
|
9 hrs
weight percent
it in weight percent (or mass percent, if you prefer).
Weight Percent
Another similar way of expressing the concentration of a solution is to express it in weight percent (or mass percent, if you prefer).
Weight percent =
weight of solute
weight of solution
x 100%
You've done this kind of calculation earlier - last term in the lesson on composition. You may already be prepared to answer the questions in exercise 2 in your workbook. If so, do that and check your answers at the bottom of the page. If not, read on.
As an example, let's consider a 12% by weight sodium chloride solution. Such a solution would have 12 grams of sodium chloride for every 100 grams of solution. To make such a solution, you could weigh out 12 grams of sodium chloride, and then add 88 grams of water, so that the total mass for the solution is 100 grams. Since mass (unlike volume) is conserved, the masses of the components of the solution, the solute and the solvent, will add up to the total mass of the solution. 12 % NaCl solution = 12 g NaCl
100 g solution
12 g NaCl
(12 g NaCl + 88 g water) = 12% NaCl solution
To calculate the mass percent or weight percent of a solution, you must divide the mass of the solute by the mass of the solution (both the solute and the solvent together) and then multiply by 100 to change it into percent.http://dl.clackamas.edu/ch105-04/weight.htm
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Note added at 10 hrs (2016-02-17 22:24:45 GMT)
--------------------------------------------------
单位的缩写为wt%
Weight Percent
Another similar way of expressing the concentration of a solution is to express it in weight percent (or mass percent, if you prefer).
Weight percent =
weight of solute
weight of solution
x 100%
You've done this kind of calculation earlier - last term in the lesson on composition. You may already be prepared to answer the questions in exercise 2 in your workbook. If so, do that and check your answers at the bottom of the page. If not, read on.
As an example, let's consider a 12% by weight sodium chloride solution. Such a solution would have 12 grams of sodium chloride for every 100 grams of solution. To make such a solution, you could weigh out 12 grams of sodium chloride, and then add 88 grams of water, so that the total mass for the solution is 100 grams. Since mass (unlike volume) is conserved, the masses of the components of the solution, the solute and the solvent, will add up to the total mass of the solution. 12 % NaCl solution = 12 g NaCl
100 g solution
12 g NaCl
(12 g NaCl + 88 g water) = 12% NaCl solution
To calculate the mass percent or weight percent of a solution, you must divide the mass of the solute by the mass of the solution (both the solute and the solvent together) and then multiply by 100 to change it into percent.http://dl.clackamas.edu/ch105-04/weight.htm
--------------------------------------------------
Note added at 10 hrs (2016-02-17 22:24:45 GMT)
--------------------------------------------------
单位的缩写为wt%
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