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A sample of Helium occupies 200 L at 30ºC under a pressure of 841 torr. What is the volume it occupies at standard temprature and pressure (STP)?

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Use
(P1V1/T1)=(P2V2/T2)
Standard conditions are P2 = 760 torr, T = 273 K. Don't forget to change 30 C to K.
K = 273 + C

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