The critical properties for compounds A and B, which are two compounds with similar molecular structures, are given here. No further information is available about compound B, but the vapor pressure of compound A as a function of temperature is given in Figure 7-12. Give the best possible estimates of the vapor pressures for compound B at T = 600°R, 7008R, 800°R, and 900°R.

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Vapor pressure (psia) Compound A Compound B 250 200 150 100 50 T (R) 800 1000 P. (psia) 200 250 0 0 400 500 600 700 800 Temperature (°R) FIGURE 7-12 Vapor pressure vs. temperature for compound A.