Molar Mass of a Condensable vapor:
The significance of immersing the flask as far as possible into the hot water bath?
= Is to allow the volatile liqued to evaporate, current?
It is but if you think about it and DON'T heat the ENTIRE flask, then the liquid will evaporate as you want it to but it may condense, also, on the cooler walls of the flask near the top. If this is a density or molar mass of a volatile liquid you want the entire "bulb" to contain the vapor and none of the liquid.
Yes, you are correct. Immersing the flask as far as possible into the hot water bath is done to allow the volatile liquid to evaporate. This is important when determining the molar mass of a condensable vapor because the molar mass is calculated based on the principles of the ideal gas law, specifically the relationship between pressure, volume, temperature, and the number of moles of gas.
By immersing the flask as far as possible into the hot water bath, the temperature of the volatile liquid inside the flask is increased. As the temperature increases, the molecules of the liquid gain more energy and start to convert into vapor or gas phase. The increase in temperature ensures that most, if not all, of the liquid evaporates, so that the only substance present in the flask is the condensable vapor.
Assuming the flask is sealed to maintain a constant volume, the pressure inside the flask can be measured using a pressure sensor or a manometer. This pressure measurement, along with the known temperature and the ideal gas law equation (PV = nRT), allows us to calculate the number of moles of the condensable vapor.
Knowing the number of moles and the mass of the vapor, we can then determine the molar mass of the condensable vapor by dividing the mass by the number of moles. This molar mass information is valuable in understanding the chemical composition and properties of the substance being studied.