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求める過マンガン酸カリウム水溶液のモル濃度をc(mol/L)とおく。
化学反応式の量的関係より
0.050mol/Lx(10/1000)Lx(2/5)=
c(mol/L)x(8.0/1000)
0.2=8c
c=0.025
よって,0.025mol/L

まぃこ✩.*˚

助かります💦ありがとうございます!

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