To find the concentration of a solution, we need to know the amount of solute (in this case, NaCl) and the amount of solvent (in this case, water). The concentration can be calculated by dividing the mass of the solute by the volume of the solution.

Given data:
Mass of NaCl = 48g
Mass of water = 200g
Temperature = 293K

First, we need to find the volume of the solution. Since we are given the mass of water, we can assume that the density of water is 1g/mL. Therefore, the volume of water is equal to its mass, which is 200mL.

We can assume that the density of NaCl is also 1g/mL, so the volume of NaCl is 48mL.

Now, we can calculate the total volume of the solution by adding the volumes of NaCl and water:
Total volume of solution = Volume of NaCl + Volume of water
= 48mL + 200mL
= 248mL

The concentration of the solution is given by:
Concentration = Mass of solute / Volume of solution

Substituting the values:
Concentration = 48g / 248mL

Simplifying the units:
Concentration = 0.194g/mL

Therefore, the concentration of the solution at 293K is 0.194g/mL.

In summary, the concentration of the NaCl solution at 293K is 0.194g/mL. This was calculated by dividing the mass of NaCl (48g) by the total volume of the solution (248mL), which was obtained by adding the volumes of NaCl and water.