Hydrogen gas was cooled from 373 K to 283 K. Its new volume is 750.0 mL. What was the original volume? 

Which gas law should you use? (use A = Avogadro's, B = Boyle's, C= Charles's)

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Answer: ___________

A gas cylinder contains a gas at 5.25 atm pressure. When the gas is allowed to expand to a final volume of 12.5 L, the pressure drops to 1.85 atm. What was the original volume of the gas?

If, at constant pressure, the absolute temperature of a flask equipped with a moveable piston is reduced to half its original absolute temperature, what must be the new volume? A) 1/4 the original volume B) 1/2 the original volume C) two times the original volume D) four times the original volume E) equal to the original volume