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Based upon the way it is stated, because the substance is DISSOLVED in the water. Therefore, the "w" will INCLUDE the substance that it has dissolved. By the way, the unit for "w" is in liters, not pounds or kilograms. As we all know the density of the water. Therefore, we can easily figure out the amount of substance (in weight) that has dissolved in the water.
參考資料
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引用自: http://tw.knowledge.yahoo.com/question/question?qid=1511112000982
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引用自: http://tw.knowledge.yahoo.com/question/question?qid=1511112000982
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