10-04-10_notes

# Grams of butene c4h8 flows through a second pipe at

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grams of butene (C4H8) flows through a second pipe at the same temperature and pressure. Which are different for the two gases? (a) volumetric flow rate (b) specific molar volume (L/mol) (c) mass density (g/L)? Assume IG. If they are different, which

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1/27/11 STP If you don’t know R, you can solve the IG equation by comparing to standard conditions. Standard temp = 273 k Standard pressure = 1 atm Standard volume = ___________ PV = nT PsVs Ts
1/27/11 Ideal Gas Mixtures Suppose nA moles of A, nB moles of B, nC moles of C … are contained in a volume V at temperature T and pressure P We can define the following: PA- the paertial pressure of A – The pressure that would be exerted if A were alone in V at the same T

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1/27/11 Ideal Gas Mixtures If the mixture of A, B, C … behaves in an ideal manner, we have an ideal gas mixture PV=nRT for the entire mixture P V=nRT for each component If we divide the second equation by the first, we get: pA=vAP
1/27/11 Ideal Gas Mixtures Following similar mathematical manipulations, we can arrive at: vA=yAV vA/V is the mole fraction of A 100 times this quantity is the percent by volume The volume fraction of a substance in an IG misture equals its mole fraction

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1/27/11 An adult takes about 12 breaths per minute, inhaling roughly 500 mL of air with each breath. The molar compositions of the expired gases are as follows: The inspired gas is at 24°C and 1 atm, Species Inspired Gas (%) Expired Gas (%) O2 20.6 15.1 CO2 0.0 3.7 N2 77.4 75.0 H2O 2.0 6.2
1/27/11 Alternate EOS IG EOS is easy to work with, but often inaccurate

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