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塩化ナトリウム53.7gをすべてとかして飽和水溶液を作るのに必要な20℃の水をxgとする。
100:35.8=x:53.7
35.8x=5370
179x=26850
x=26850/179

26850÷179=150
よって必要な水は150g

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