Calculate the osmotic pressure of a solution containing 18.75 mg of hemoglobin in 15.0 mL of solution at 25 °C. The molar mass of hemoglobin is 6.5 x 10^4 g/mol.

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1. Convert the mass of hemoglobin from milligrams to grams by dividing by 1000.
2. Calculate the number of moles of hemoglobin using the formula: \( \text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}} \).
3. Convert the volume of the solution from milliliters to liters by dividing by 1000.
4. Use the formula for osmotic pressure: \( \Pi = \frac{n}{V}RT \), where \( n \) is the number of moles, \( V \) is the volume in liters, \( R \) is the ideal gas constant (0.0821 L·atm/mol·K), and \( T \) is the temperature in Kelvin.
5. Convert the temperature from Celsius to Kelvin by adding 273.15 to the Celsius temperature.