百分比權(quán)數(shù) percentage weight

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Weight PercentAnother 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.

若能收集到該詞條相關(guān)資料的跟帖者給予獎勵，根據(jù)收集資料的水平給予5～100不等的論壇幣，當(dāng)然也可以談?wù)勛约旱目捶�、�?yīng)用，上傳資料等等都可以。

請大家盡量不要復(fù)制一些搜索引擎很容易收集到的資料。

     我每天都會發(fā)送不等數(shù)量的詞條，所以誠邀不同統(tǒng)計背景的各路大俠給予評論。

     歡迎大家多多跟帖！要數(shù)量也要質(zhì)量喲

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關(guān)鍵詞：percentage percent Weight Eight weigh percentage exercise prepared solution already