50 g of NaCl is mixed with water to make. 5 L of salt water. Which is the solute?

The correct answer to the following question will be "NaCl".

Explanation:

A solute is being known as the soluble material within a liquid or a solution. The solvent is available in larger quantities than those of the solute among fluid. Concentration seems to be a calculation including its quantity of solvent contained in such a liquid solution, regard to something like the solvent volume.

So that NaCl is the right answer.