I hope this helped♡ I drew the realationship of variables
Answer:
The concentration of KBr is
Explanation:
From the question we are told that
The mass of KBr is 
The molar mass of KBr is 
Volume of water is
This implies that the volume of the solution is 
The number of moles of KBr is

Substituting values

The concentration of KBr is mathematically represented as
Subsoil is the layer of soil under the topsoil on the surface of the ground.
It is supposed to protect the cell from it's surroundings, or from the outside.