Answer is: osmotic pressure.
The direction of osmotic pressure is always from the side with the lower concentration of solute to the side with the higher concentration, in this example, from solution b (5% glucose) to solution b (25% glucose).
Osmotic pressure, alongside the vapor pressure depression, freezing point depression and the boiling point elevation are the colligative properties od solution.
The box is expected to go to the right since the 3N is stronger than the 2N and the rightward force will over come the leftward force.
Answer:

Explanation:
According to the ideal gas law equation:

Let's express the number of moles in terms of mass and molar mass:

Let's divide both sides by volume:

Notice that:

So the equation becomes:

Expressing density:

Substituting the given values:

6.023 x 10^23 . Common salt . Total of 12.046 x 10^23 atoms