М(Н₃ВО₃) = 3*1 + 11 + 3*16 = 62
ω(О) = (3*16/62) = 77%
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М(Н₃ВО₃) = 3*1 + 11 + 3*16 = 62
ω(О) = (3*16/62) = 77%