Molecular Weight Of A Volatile Liquid. Make sure that the cork is not inserted in the tubing in the neck of the flask.watch the liquid level in your flask; The determination of molecular weight of a volatile liquid using the ideal gas law theory chemical and physical methods for determining atomic and molecular weights are an important way of analyzing and categorizing new materials.
Basically, the experiment’s main focus isto determine the molecular weight of that volatile liquid after it has been. To determine the molar mass of an unknown compound (a volatile liquid). The difference in mass between the empty container and the final measurement was 1.129 g.