Assume ideal gas behavior to answer the following questions. 1) What is the specific gravity of propane gas (C3H8) at 38C and a pressure of 800mmHg relative to air at STP? (Mair=29) [3/6] 2) Is the ideal gas assumption valid for propane at the given temperature and pressure? Justify your answer. 3) Define the terms critical temperature and critical pressure. /3] /1]