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理化 幫我算 我要看看怎算
Oct 10th 2013, 01:48

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A: 12% 重量百分濃度= (溶質重 除 溶液重) x 100% 2L X 1000 = 2000ml 2000ml x1.25 g/ml = 2500g 300g / 2500g = 0.12 w% = 0.12 x 100% = 12%...
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