Question

Calculate the relative molecular mass of Ammonium chloroplatinate ${(N{H_2})_2}PtC{l_6}$ .

Answer 1

Molecular mass of the given substance can be defined as the sum of total atoms present in that compound. In the common language , when we have to calculate the molecular mass of a particular substance we add the molecular mass of the elements present in that compound.

Complete answer: To calculate the molecular mass of the given compound , we have to focus separately on the molecular masses of the particular elements present in that compound.
In our given question, we have to give emphasis to the molecular mass of Nitrogen , Hydrogen , platinum and chlorine.
Also remember to note the number of atoms present of a particular atom in a given compound.
So let’s calculate the molecular mass of the Ammonium chloroplatinate ${(N{H_2})_2}PtC{l_6}$ .
Since, we know that the :
Molecular mass of Nitrogen is : $14$
Molecular mass of Hydrogen is : $1$
Molecular mass of Platinum is : $195.08$
Molecular mass of Chlorine is : $35.5$
Now , adding all the elements , we will get :
Mass of Ammonium chloroplatinate ${(N{H_2})_2}PtC{l_6}$ $= (14 \times 2) + (1 \times 8) + 1950.8 + (35.5 \times 6)$
$= 28 + 8 + 195.08 + 213$
$= 444.08$ u .
So , the molecular mass of the Ammonium chloroplatinate ${(N{H_2})_2}PtC{l_6}$ is $= 444.08$ u.

Note:
The molecular masses of the compound or element has a standard unit of Dalton , or it is written by the symbol $u$ i.e. atomic mass unit . Also one more point to keep in mind is that the different molecules of the same compound may have different molecular masses because they may be composed of different isotopes of the given element.