Calculate the volume occupied by 25.2 g of CO_2 at 0.84 atm and 25 degree C (R =

Question

Calculate the volume occupied by 25.2 g of CO_2 at 0.84 atm and 25 degree C (R = 0.08206 L atm/mol K). A) 0.060 L B) 1.34 L C) 16.9 L D) 24.2 L. E) 734 L A sample of propane has a volume of 35.3 L at 315 K and 922 torr. What is its volume at STP (R = 0.08206 L atm/mol K, 1 atm = 760 torr)? A) 25.2 L B) 30.6 L C) 33.6 L D) 37.1 L E) 49.2 L A flask with a volume of 3.16 L contains 9.33 grams of an unknown gas at 32.0 degree C and 1.00 atm. What is the molar mass of the gas (R = 0.08206 L atm/mol K)? A) 7.76 g/mol B) 66.1 g/mol C) 74.0 g/mol D) 81.4 g/mol E) 144 g/mol

Explanation / Answer

27) answer : C) 16.9 L

moles of CO2 = 25.2 / 44 = 0.573

pressure = 0.84 atm

temperature = 25 0C = 298 K

P V = n R T

0.84 x V = 0.573 x 0.0821 x 298

V = 16.7

volume = 16.9 L

28)

P1 V1 / T1 = P2 V2 / T2

922 x 35.3 / 315 = 760 x V2 / 273

V2 = 37.1 L

volume = 37.1 L

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