1. The triple point of CO2 is -56.2C, and the vapour pressure of solid CO2 below
ID: 702018 • Letter: 1
Question
1. The triple point of CO2 is -56.2C, and the vapour pressure of solid CO2 below this temperature is given by: log,op. -1353/T + 9.832 = where p is in mmHg and T in K. The latent heat of fusion at the triple point is 1990 cal mol. Use these data to estimate the vapour pressure of liquid CO2 at 0C, stating carefully the assumptions you make. (at the triple point sv-sl + lv) [38.3 atm] 2. Using steam tables, calculate the fugacity of liquid water at 30C and at: (a) its saturation pressure. (b) 100 bar [0.0424 bar; 0.0455 bar]Explanation / Answer
The vapour pressure of solid at the triple point(216.95K) is calculated by the given formula is 3940.4 mm Hg
The vapour pressure in atm is (3940.4/760) 5.184 atm
By Vant Hoff's equation we can calculate the vapour pressure of solid CO2 at given temperature( at 273.15K)
The equation is
ln(P2/P1) = (H/R)*(1/T1 - 1/T2)
Where R is Universal has constant 8.314 J/K.mol
H is latent heat of fusion 1990*4.18= 8318.2 J/mol
We calculate the vapour pressure of solid CO2 at 273.15 K using above formula is 13.388 atm
The last line is not clearly mentioned that what is 38.3 atm so the last line should be clearly specified about the 38.3 atm pressure
Answer of question number 1 is over
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