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質量パーセント濃度=溶質の質量/溶液×100=溶質の質量/溶質+溶媒×100なので
109.2/109.2+100×100=109.2/209.2×100=52.19 よって52

くれあ

分かりやすく丁寧にありがとうございます_(_^_)_
溶質と溶媒を足さないと行けなかったんですね

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