Part A For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of Changes in both temperature and phase. What must the initial speed of a lead bullet be at a temperature of 27.0 C so that the heat developed when it is brought to rest will be just sufficient to melt it? Assume that all the initial mechanical energy of the bullet is converted to heat and that no heat flows from the bullet to its surroundings. (Typical rifles have muzzle speeds that exceed the speed of sound in air, which is 348 m/s at 27.0' C ). Express your answer in meters per second. AEd O ? U = m/sPart A A flask with a volume of 1.50 L , provided with a stopcock, contains ethane gas (C2H6 ) at 300 K and atmospheric pressure (1.013 x 10 Pa). The What is the final pressure of the ethane in the flask? molar mass of ethane is 30.1 g/mol. The system Express your answer in pascals. is warmed to a temperature of 490 K , with the stopcock open to the atmosphere. The stopcock is then closed, and the flask is cooled to its original ? temperature. Symbols Pf = PaA flask with a volume of 1.50 L , provided with a stopcock, contains ethane gas (C2H ) at 300 K and atmospheric pressure (1.013 x 10 Pa). The Part B molar mass of ethane is 30.1 g/mol. The system is warmed to a temperature of 490 K , with the stopcock open to the atmosphere. The stopcock is How many grams of ethane remaining in the flask. then closed, and the flask is cooled to its original temperature. Express your answer in grams. VO AEd ? m = g