A sample of CO2 gas fills a container with a volume of 44.5 L. When the volume is decreased to 13.8 L at a constant temperature, the pressure inside the container is 6.25 atm. What was the pressure inside the container originally? A) 0.035 atm
B) 0.51 atm
C) 1.94 atm
D) 3.84 atm
E) 6.25 atm

I know the answer is C but I need the work. Everytime I do it, I get confused. Thanks!

Apeak with a retention time of 407 s has a width at half-height (w1/2) of 7.6 s. a neighboring peak is eluted 17 s later with a w1/2 of 9.4 s. a compound that is known not to be retained was eluted in 2.5 s. the peaks are not baseline resolved. how many theoretical plates would be needed to achieve a resolution of 1.5?

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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.