Question

A,B,C is a dobereiner's triads.complete the following chart and give reason for the answer A=10.08 ,B=12.01,C=?

Answer 1

Answer:

13.4

Explanation: (A+C)/2 = B

=> (10.08+C)/2 = 12.01

=> 10.08+C = 24.02

therefore C=13.4

Answer 2

Answer:

Mass of C is $13.94$.

Explanation:

According to Dobreiner's triad, the arithmetic mean of the atomic masses of the other two elements is equal to the atomic mass of the central element.

Arithmetic mean of mass of A and C is equal to mass of B.

$\frac{M_{A}+M_{C} }{2} = M_{B}$

Mass of A,  $M_{A} = 10.08$

Mass of B, $M_{B} = 12.01$

Mass of C, $M_{C}$ = ?

Putting the values in the above equation;

$\frac{10.08 + M_{C} }{2} = 12.01$

$10.08 + M_{C} = 2 * 12.01$

$M_{C} = 24.02 - 10.08 = 13.94$

Therefore mass of C is $13.94$.

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