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mech3020-s11-hw09

# mech3020-s11-hw09 - purchased a cubic meter bottle at 300 K...

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MECH 3020 Thermodynamics II: Homework set #9, Due 2/28 (Monday) 1. A gas mixture consists of 2 parts CO 2 , 2 parts Ne, and 1 part H 2 on a mass basis. Compute the mole fractions of the components and the mixture molecular mass. 2. A rigid tank of volume V = 0 . 2 m 3 contains N 2 at P 1 = 1 MPa and T 1 = 300 K. It is then connected to a supply line containing He, and it is ﬁlled to a ﬁnal state of P 2 = 4 MPa and T 2 = 320 K. Determine (a) the mass of He that entered the tank, (b) the mole fractions of N 2 and He in the ﬁnal gas mixture and the mixture molecular mass. To work this out, note that the total kmols of gas, for both the initial and ﬁnal states, can be obtained from the ideal gas law. 3. You have been hired by a wealthy client to determine the identity of a mystery gas. Your client
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Unformatted text preview: purchased a cubic meter bottle, at 300 K at 1 atm, of supposedly pure N 2 gas. Upon testing the gas in their laboratory, they discovered that that the gas did indeed occupy 1 m 3 volume at 300 K and 1 atm, yet it was not pure N 2 ! You and your team separated the N 2 from the gas, and found that the pure N 2 in the bottle had a mass of 1.0811 kg and the remaining gas (i.e., the contaminant) had a mass of 0.1301 kg, corresponding to a total mass of gas mixture of 1.2112 kg. Based on this information, along with the molecular mass data in Table A-1, deduce the chemical formula for the contaminant. 1...
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