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A sample of helium has a volume of 3 liters when the pressure is 500 torr. What volume does the gas occupy at 300 torr?

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J.R. S. | Ph.D. in Biochemistry--University Professor--Chemistry TutorPh.D. in Biochemistry--University Profes...
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When temperature is constant, you are dealing with Boyle's Law:  P1V1 = P2V2
(500 torr)(3 L) = (300 torr)(x L)
x = 5 liters
McKenzie S. | Medical Physics Graduate Student, Experienced Math and Science TutorMedical Physics Graduate Student, Experi...
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Using Boyle's law, P1V= P2V2
 
P1 = 500 torr
V1 = 3 L
P2 = 300 torr
V2 = ?
 
(500 torr)(3 L) = (300 torr)V2 
V2 = (500 torr)(3 L) / (300 torr) = 5 L