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20. A sample of helium gas has a volume of 900. mL and a pressure of...

20. A sample of helium gas has a volume of 900. mL and a pressure of 2.50 atm at 298 K. What is the new pressure when the temperature is changed to 388 K and the volume is decreased to 450. mL? Express your answer as a numeric response to the proper degree of certainty (# of significant figures).

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