Chemistry
Senior High
分かりません( ˘•ω•˘ ).｡oஇ
(2) 自然界のホウ素は相対質量 10.0 の 'Bと相対質量 11.0の "B の2種類の同位体からなる
原子量が 10:8 だとすると, 10B の存在比は何%か。
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