The vapor pressure of liquid bromoethane, C2H5Br, is 100. mm Hg at 263 K. A sample of C2H5Br is placed in a closed, evacuated 544 mL container at a temperature of 263 K. It is found that all of the C2H5Br is in the vapor phase and that the pressure is 75.0 mm Hg. If the volume of the container is reduced to 316 mL at constant temperature, which of the following statements are correct? a. The pressure in the container will be 108 mm Hg.
b. No condensation will occur.
c. Some of the vapor initially present will condense.
d. Liquid pentane will be present.
e. Only pentane vapor will be present.

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.