1. How would the observed molar mass of the unknown liquid have been affected by the following circumstances. (would it be higher than the true value, lower than the value or remain unchanged.) a) Because some portion of the neck of the flask was above the hot water level, not all the vapor in the flask was at the same temperature. b)Some of the liquid had not yet vaporized when the flask was removed from the bath c) While the flask was cooling, some of the vapor effused through the foil pinhole in the cap.