Please assist me with these three questions:
1. If a 275-mL gas container has pressure of 732.6 mm Hg at -28 degrees C, how many moles of gas are in the container?
2. If the gas is condensed into a liquid, and the liquid weighs 1.95 g, what is the molar mass of the gas?
3. If a balloon has a volume of 0.58 L at 22 degrees C, find its volume if it is placed in a dry ice/acetone bath at -78 degrees C.