Final answer:
The exact vapor pressure of propanone at 45°C requires specific data or a reference to a vapor pressure curve. An estimate could be made using the Clausius-Clapeyron equation, but without such data, the value cannot be accurately determined.
Step-by-step explanation:
The student has asked for the vapor pressure of propanone (acetone) at 45°C. The vapor pressure of a substance can be determined from its vapor pressure curve, which is a graph that shows how vapor pressure varies with temperature. If actual data or a graph is not available, an estimation can be done using the Clausius-Clapeyron equation which relates the vapor pressure at two different temperatures to the heat of vaporization. However, if the question does not provide sufficient data to use this method, one cannot calculate the exact vapor pressure of propanone at 45°C without additional information.
For reference, a textbook or other authoritative source can often provide the needed vapor pressure data at specified temperatures. In a standard setting, propanone has a vapor pressure around 24.46 kPa at 20°C, and the vapor pressure increases with temperature. Therefore, at 45°C, the vapor pressure of propanone would be higher than 24.46 kPa, but the exact value requires precise measurements or data from a reliable source. Understanding vapor pressure is crucial in applications like distillation, where the separation of liquids based on volatility is essential.