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Isobars and Isotopes

Equivalent ma...

Question

Equivalent mass of calcium in calcium carbonate is _______________.

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Solution

Equivalent mass of an element (X) = $\frac{A t o m i c m a s s o f X}{V a l e n c y}$
Atomic number of calcium (Ca) = 20
Atomic mass of calcium (Ca) = 40
Electronic configuration of calcium (Ca) = 2,8,8,2
The valency of calcium = 2
Hence equivalent mass of calcium = $\frac{40}{2} = 20$
Therefore the equivalent weight of the calcium in calcium carbonate is = 20

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