209s10a12s

# 209s10a12s - DCGN209-Spring10 Homework#12 p 1 of 2 Hand-In...

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DCGN209-Spring’10: Homework#12 p. 1 of 2 Hand-In Problems Due: 2:00 PM, Friday April 30, 2010 A. In this problem you will address one of the “blanks” in the attached table – the pressure at the triple point for methanol, CH 4 O. 1. (15 pts) Calculate EQ 298 P , the equilibrium vapor pressure of liquid methanol. 2. (7 pts) Use the results of #1 to calculate vap H of liquid methanol. 3. (8 pts) Estimate the pressure at the triple point for methanol. B. In this problem we will calculate EQ 298 P , the equilibrium vapor pressure of liquid CO 2 at 25.00 0 C; this will be the minimum pressure needed (at ambient conditions) to liquefy CO 2 in preparation for pumping it underground (carbon sequestration). Some additional data is given below. ρ [CO 2 (s)] = 1.50 g cm -3 . ρ [CO 2 (L)] = 1.179 g cm -3 . 1. (15 pts) Calculate fus H of solid CO 2 . 2. (7 pts) Calculate vap H of liquid CO 2 . 3. (8 pts) Calculate EQ 298 P .

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DCGN209-Spring’10: Homework#12 p. 2 of 2 P = 100 MPa M T tp P tp T m fus H T sub sub H T b vap H T m T C P C Formula g/mole K Pa K kJ/mole K kJ/mole K kJ/mole K K kPa O 2 31.9988 54.36 146.33 54.36 0.44 90.17 6.82 65.0 154.59 5043 H 2 O 18.0154 273.16 611.73 273.15 6.010 373.15

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