Question

The densities of calcium(Ca) and Barium (Ba) are 1.55 and 3.50 gcm–3 respectively.
Based on Dobereiner’s law of triads can you give the approximate density of
strontium (Sr)?

Answer 1

Given info : The densities of calcium(Ca) and Barium (Ba) are 1.55 g/cm³ and 3.50 g/cm³ respectively.

To find : Based on Dobereiner’s law of triads, we have to give the approximate density of strontium (Sr).

Solution : according to Dobereiner's triads law, when we arrange three elements in their atomic mass, atomic mass of middle element is average of 1st and 3rd elements.

We know, Ca , Sr and Ba form Dobereiner's triad.

so, Density of Sr = average of densities of Ca and Ba.

= (1.55 + 3.50)/2

= 5.05/2 = 2.525 g/cm³

Therefore the density of strontium is 2.525 g/cm³ .

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Answer 2

molecular mass is directly proportional to density. d=M/v

so densiy of Strontium is mean of calcium and barium according to doberenier

density of Strontium =1.55+3.51/1=2.53

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