Question

A trivalent metal has its equivalent mass 12. The
molecular mass of the metal hydroxide is
(1) 87 u (2) 63 u
(3) 55 u (4) 41 u

Answer 1

Answer : The molar mass of metal hydroxide will be 87 u.

Solution : Given,

Equivalent mass = 12 g/eq

Valency of trivalent metal element = 3

Molar mass of hydroxide = 17 g/mole

The molecular formula of trivalent metal oxide is,  

Formula used :

Molar mass of an element = Equivalent mass × Valency

Now put all the given values in this formula, we get

Molar mass of an element = 12 × 3 = 36

Now we have to calculate the molar mass of  

Molar mass of  

Therefore, the molar mass of metal hydroxide will be 87 u.

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