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Avogadro's Law & Gay Lussac's Law

A bivalent me...

Question

A bivalent metal has an equivalent mass of 32. The molecular mass of the metal nitrate is (in amu):

A

182

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B

168

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C

192

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D

188

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Solution

The correct option is D 188
Atomic mass of metal $= 32 \times 2 = 64 a m u$
Molar mass of metal nitrate $= M (N O_{3})_{2}$
= 64 + 28 + 48 + 48 = 188.

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