a) Assume that air pressure is 1.00 atm and the air temperature is 14.6o C. If t
ID: 1702353 • Letter: A
Question
a) Assume that air pressure is 1.00 atm and the air temperature is 14.6o C. If the abolute zero apparatus is open to the air, how many moles of air will it hold?
moles
b) Suppose now that the apparatus is sealed, and the temperature rises to 34.3o C. Find the pressure inside the apparatus now.
atm
Explanation / Answer
a) Given that P1 = 1.00 atm T1 = 14.6 oC = 287.6 K At STP P2 = 1.00 atm T2 = 273 K V2 = 22.4 L So that P1V1 / T1 = P2 V2 / T2 ==> V1 = P2 V2 T1 / P1 T2 = 1.00 * 22.4 * 287.6 / 1.00 * 273 = 23.59 L Therefore n = P1 V1 / R T1 = 1.00 * 23.59 / 0.0821 * 287.6 = 0.999 moles b) We know that P1 / T1 = P2 / T2 ==> P2 = P1 * T2 / T1 = 1.00 * 307.3 / 287.6 = 1.068 atm
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