Question

1) What is the final pressure (expressed in atm) of a 3.05 L system initially at 724 mm Hg and 298 K that is compressed to a final volume of 2.51 L at 273 K? 1) 2) What is the pressure of a 1.0 L flask containing 0.60% of He at 25°C? (R-0.0821 L atm/mol K) 3) What is the volume of 28.0 g of nitrogen gas at STP? 3) 4) What is the final pressure of a system (atm) that has the volume increased from 0.75 L to LIL with an initial pressure of 1.25 atm? 4) 5) A rigid cylinder contains 2.00 liters of gas at a temperature of 25°C. If the pressure of this gas is changed from 0.500 atmospheres to 1.50 atmospheres, what will be the new temperature (in Kelvin, reported to three significant figures) of the gas? (The volume is constant.) 5)

Answer 1

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0 PV = ART Ideal gh equation P= Pressure of gas R= ideal gas constant Ve volume of gy Te temperature = mole of ga for constant nl molest of gay Pivi = P₂ 12 Per V, and I are initial presure, To T2 volume and temperature of gas respectively P2, V, and To are final pressure, volume and temperature of gas respectively. P2 = Pivi Tz TIVI P = 724 mm Hg = 0.953 atm (760 mm Hg = latm). V = 3.05 L V2 = 2.511 T = 298k T2 = 273K P2 = 2.953 atm x 3.05L X 273k = 1:06atm 298K X 2151L Hence, final pressure is 1.06 atm.