18. At a temperature of 260 K, the gas in a cylinder has a volume of 45.0 L. If the volume of the gas in decreased to 20.0 L, what must the temperature be for the gas pressure to remain constant? (3pts)

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19. A gas has a volume of 6.0 L at a pressure of 75 kPa. What happens to the volume when the pressure is increased to 180 kPa if the temperature does not change? (Hint: You may need to use one of the formulas) (3pts)