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olgaslizova
@olgaslizova
September 2021
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вычеслите массовую долю бора в оксиде бора (3)
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UlyanaXXX
W % (B) = M (B) / M (B2O3) = 2*11/(2*11 + 3*16) = 22/70=0,31= 31%
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