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Use the combined gas law and solve.

(PV/T)1 = (PV/T)2

P1 = 1201 torr, V1 = 40L, T1= 50C = 323K must be kelvin for gas laws

STP implies P2 = 760 torr, T2 = 273K, V2 is the unknown

Substitute and solve....

(1201x50 / 373) = (760 V2 / 273) rearrange with algebra and solve

V2 = (1201x50x273)/(373x760) answer will be in liters

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Q: What volume will 40.0L of He at 50.00 C and 1201 torr occupy at STP?
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