The goal of this lab was to find the molar mass of an unknown volatile liquid using the provided equipment and knowledge of gases. In order for this to be accomplished, many variables needed to be measured, like the pressure of the room, the molar mass of the gas, the volume of the gas, and the temperature of the water the gas was in. First, the volatile liquid was heated up until it evaporated. After collecting the required data, calculations were done to determine the molar mass of the compound. Key terms used in this lab are the ideal gas law, PV = nRT, which was used in finding the molar mass. Another term is vapor pressure, which is the pressure exerted by a liquid in gaseous form. This was important to know since the boiling point of