To calculate the osmotic pressure of the solution at the new temperature, we can use the formula:

$ \pi = \text{CRT} $

Since the concentration $ C $ and the gas constant $ R $ remain constant, the ratio of the osmotic pressures at two different temperatures is given by:

$ \frac{\pi_1}{\pi_2} = \frac{T_1}{T_2} $

Thus, we can express the osmotic pressure at the second temperature as:

$ \pi_2 = \frac{\pi_1 \cdot T_2}{T_1} $

Substituting the given values:

$ \pi_2 = \frac{7 \times 10^5 \times 283}{273} $

After calculation, this simplifies to:

$ \pi_2 = 72.56 \times 10^4 \, \text{Nm}^{-2} $