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6mLのうち残った3mLは水素
燃えた3mLは水素2:酸素1だから水素2mL酸素1mL
燃やす前は水素5mLと酸素1mLあった
分子量は水素2:酸素16なので物質量の比は
2×5:16×1 = 5:8

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ありがとうございます🙇‍♀️🙇‍♀️

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