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

The approximate density of Strontium (Sr) is 2.525 g/cc

Explanation:

Given:

Densities of Calcium (Ca) and Barium (Ba) are 1.55 g/cc and 3.50 g/cc respectively

To find out:

Approximate density of Strontium

Solution:

• Dobereiner’s triads are groups of elements that shared similar physical and chemical properties.

• According to Dobereiner's law of triads, the arithmetic mean of the atomic masses of the first and third element in a triad would be approximately equal to the atomic mass of the second element in that triad.

• This law could be extended for other quantifiable properties of elements, such as density.

Thus, the density of Sr will be the arithmatic mean of the densities of Ca and Ba

Therefore, density of Sr

$=\frac{1.55+3.5}{2}$

$=2.525$ g/cc

Hope this answer is helpful.

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