Question

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The relative formula mass (mr) of a group 2 metal carbonate is 197.
Relative atomic masses(Ar): C=12 O=16
Calculate the relative atomic mass(Ar) of the group 2 metal in the metal carbonate.
Name the group 2 metal.

Relative formula mass(Ar)=
Metal=

Answer 1

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Name the group 2 metal.

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The group 2 metal is : Barium (Ba)

Given :

Relative formula mass of group 2 metal : 197

Relative atomic masses : C = 12 , O = 6

We know that the valency of group 2 metal is 2. Hence, it forms MCO3 metal carbonates.

Formula used :

Relative formula mass

A . T . Q ,

Let the relative mass of group 2 metal be : Z

Then,

Z + 12 + 3(16) = 197

Z + 60 = 197

Z = 197 - 60

Z = 137

Therefore :

The relative mass of group 2 metal(Z) is : 137

Hence, the group 2 metal is : Barium (Ba)

Reason :

The relative atomic mass of Barium (Ba) is 137

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