Question

What will be the mass of two moles of $KCl$?

Answer 1

Hint: We need to know that the molar mass of a chemical compound is equal to the mass of the sample which is present in the compound and it should be divided with the amount of substance present in the sample. And the molecular weight is another term of molar mass which is used for the molecular compounds. And this is an intensive property. Because, it will not depend on the size of the sample. The molar mass is expressed in terms of kg/mol.

Complete answer:
As we know that the molar mass of two moles of potassium chloride is equal to \[149g\]. The components present in the potassium chloride are one atom of potassium and one atom of chlorine. Hence, to find the molar mass of potassium chloride, we have to add each of the masses of potassium and chlorine. So that we get the molar mass of potassium chloride.
The atomic weight of potassium is equal to\[39g\]and the atomic weight of chlorine is equal to\[35.5g\]. While adding this, we will get the molar mass of one of potassium chloride.
Mass of one mole of $KCl$ \[ = \left( {36 + 35.5} \right) = 74.5g\]
Hence, mass of two mole of $KCl$ \[ = 2 \times 74.5 = 149g\]

Note:
We have to know that potassium chloride is a chemical element having the formula, $KCl$ with molecular weight \[74.5g/mol\]. It does not have any odor and it is a colorless or white crystalline in appearance. The solid potassium chloride is completely soluble in water. Potassium chloride is mainly used to obstruct low blood levels. If there is deficiency in potassium, it may cause problems like illness, vomiting and diarrhea.