Term
Ideal Gas Calculation Valid?
(Diatomic Gases) |
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Definition
error is less than 1% if the ideal specific volume is greater than 5 L/mol
Calculation:
ideal specific volume = (R*T)/P |
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Ideal Gas Equation Valid?
(non-diatomics) |
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Definition
| error is less than 1% if the ideal specific volume is greater than 20 L/mol Calculation: ideal specific volume = (R*T)/P |
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Term
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Definition
T = 273 K
P = 1 atm
V = 0.022415 m^3
n = 1 mol |
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Definition
T=273 K
P= 1 atm
V= 22.415 L
n= 1 mol |
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Term
| Standard Conditions Amer. E. |
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Definition
T= 492 R
P=1 atm
V= 359.05 ft^3
n=1 lb-mole
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Term
| Conversion from Standard Conditions |
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Definition
| (P*V)/(Ps*(specific volume at s)) = n*(T/Ts) |
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Definition
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Term
| Mole Fraction and Volume Fraction |
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Definition
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Term
| Reduced Temperature and Pressure |
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Definition
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Term
| Compressibility Factor 'z' |
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Definition
z = (P*specificV)/(R*T)
use compressibility chart to find z
using Vr(ideal), Tr, and/or Pr |
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Definition
For Helium and Hydrogen
Tc(correction) = Tc + 8 K
Pc(correction) = Pc + 8 atm |
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Definition
-as power series usually truncated after first term
-uses 'w' Pitzer acentric factor
-uses reduced temperature
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Definition
-includes van der Waals
-includes SRK equation |
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Definition
Memorize in book
also memorize constants |
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Term
| Law of Corresponding States |
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Definition
| the values of certain physical properties of a gas -such as compressibility factor- depend to great extent on the proximity of the gas to its critical value |
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Definition
| relates the molar quantity and volume of a gas to temperature and pressure |
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Term
| Kinetic Theory of Gases Assumptions for the Ideal Equation of State |
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Definition
-gas molecules have negligible volume
-exert no forces on one another
-collide elastically with the walls of the container |
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| Density in terms of the ideal gas equaiton |
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Definition
| density = P*(Average MW of a gas)/(R*T) |
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Definition
T(R) = T(F) + 459.69
T(R) = 1.8T(K) |
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Definition
-used in compressibility chart
Vr(ideal) = ((critical pressure) * (specific volume))/(R*(critical temp)) |
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Definition
| M(avg) = ya(MWa) + yb(MWb) |
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Definition
T'c = ya(Tca) + yb(Tcb)+....
P'c = ya(Pca) + yb(Rcb)+... |
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| Liquid and Solid Density Calculations |
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Definition
1/density(avg) = sigma((mass fraction of i) /(density of i))
-assumes volume additivity (good for species with similar structures)
density(avg) = sigma((mass fraction of i)*(density of i)) |
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