Elementary Principles 180 - 6.24 (cont'd) ln(40.0 / 5.00)...

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6- 14 6.24 (cont’d) −= ⇒= = ⇒ = AA B p T ln( . / . ) ,l n . e x p ( . () ) * 40 0 500 1 339 1 299 5269 500 5269 299 19 23 19 23 5269 =( .) + K At lower explosion limit, yp T y P =⇒ = = 0 008 0 008 760 ./ ( ) ( . ) ( * kmol C H kmol mm Hg) 92 0 = 6.08 mm Hg T = 302 K = 29 C o c. The purpose of purge is to evaporate and carry out the liquid nonane. Using steam rather than air is to make sure an explosive mixture of nonane and oxygen is never present in the tank. Before anyone goes into the tank, a sample of the contents should be drawn and analyzed for nonane. 6.25 Basis: 24 hours of breathing 23°C, 1 atm y 1 (mol H O/mol) +O 2 , CO 2 n 1 (mol) @ h r = 10% 0.79 mol N /mol 2 2 Lungs O 2 CO 2 37°C, 1 atm y 2 (mol H O/mol) 2 , CO 2 n 2 (mol), saturated 0.75 mol N /mol 2 2 n 0 (mol H O) 2 Air inhaled: 12 breaths 500 ml 1 liter 273K 1 mol 60 min 24 hr min breath 10 ml 23 273 K 22.4 liter STP 1 hr 1 day mol inhaled day 1 3 n = + = bg b g 356 Inhaled air - -10% r.h.:
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