Rate of evaporation of n-octane, at 20°C, how many grams of liquid n-octane will evaporate into N₂ in 24.5 hr in a system such as that studied in Example 20.1-1 at system pressures of 

(a) 1atm, and 

(b) 2atm? The area of the liquid surface is 1.29 cm², and the vapor pressure of n-octane at 20°C is 10.45 mm Hg.