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To test Döbereiner’s idea (Problem 8.3), predict:
(a) The boiling point of HBr from the boiling points of HCl (284.9°C) and HI (235.4°C) (actual value 5 267.0°C)
(b) The boiling point of AsH₃ from the boiling points of PH₃ (287.4°C) and SbH₃ (217.1°C) (actual value 5 255°C)

Respuesta :

The boiling point of HBr = -60.15 °C

The boiling point of AsH₃ = -52.25 °C

What is Döbereiner’s idea?

  • According to Döbereiner, certain elements might be placed in groups of three related elements (referred to as "triads"),
  • And the middle element (elements are arranged according to their atomic mass) would have qualities between the other two ( the average value).

Calculation of the boiling point:

a) In the first scenario, the triad would consist of the elements Cl, Br,   and I.

And according to Döbereiner, the boiling point of HBr should be the average of HCl and HI . Therefore,

HBr estimated boiling point is:

[(- 84.9°C) + (-35.4°C)]/2 = -60.15 °C

Hence, the estimated boiling point of HBr is -60.15 °C.

b) The boiling point of AsH₃ would be the same as that of PH₃, SbH₃, and AsH₃ .

AsH₃ estimated boiling point is:

[(-87.4°C) + (-17.1°C)]/2 = -52.25 °C

Hence, the estimated boiling point of AsH₃ is -52.25 °C.

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