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Before mendeleev published his periodic table, dobereiner grouped similar elements into triads, in which the unknown properties of one member could be predicted by averaging known values of the properties of the others. to test this idea, predict the boiling point of hbr from the boiling points of hc1 (−84.9°c) and h (−35.4°c). °c

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Hydrogen bromide is the diatomic molecule with the formula HBr. It is a neutral compound and a hydrogen halide.To compute for the melting point of Br2 from the melting points of HC1 (−84.9°c) and h (−35.4°c). You must add these two amounts and divide it by 2 to get the answer:-84.9 + -35.4 / 2 = -60.15 degrees Celsius is the answer.

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