19) The vapor pressure of liquid chloroform, CHC13, is 4000 torr at 24.1 C and 1

Question

19) The vapor pressure of liquid chloroform, CHC13, is 4000 torr at 24.1 C and 100.0 torr at19) -6.3°C. What is AHvap of chloroform? A) 86.7 k)/mol B) 15.3 kJ/mol C) 576 kl/mol D) 30.1 kl/mol 20) If figure (1) represents the vapor pressure of water at 25 C, which figure represents the vapor 20)_ pressure of water at 45°C? A) figure (2) B) figure (3) C) figure (4) 21) Formaldehyde is a carcinogenic volatile organic compound with a permissible exposure level 21)_ of o.75 ppm. At this level, how many grams of formaldehyde are permissible in a 6.0- of air having a density of 1.2 kg/m37 A) 38 10-2 g formaldehyde C) 5.4 g formaldehyde B)54 10-6 g formaldehyde D) 3.8 g formaldehyde 22) Ethyl chloride, C2HsCl, is used as a local anesthetic. It works by cooling tissue as it vaporizes 22)_ its heat of vaporization is 26.4 k/mol. How much heat could be removed by 200 g of etyl chloride? A) 528 k C) 341 k4 D) 3410k B) 8.18 k

Explanation / Answer

19)

T1 = 24.1 oC

=(24.1 + 273)K

= 297.1 K

T2 = -6.3 oC

=(-6.3 + 273)K

= 266.7 K

P1 = 4*10^2 torr

P2 = 1*10^2 torr

use:

ln(P2/P1) = (H/R)*(1/T1 - 1/T2)

ln(1*10^2/4*10^2) = ( H/8.314)*(1/297.1 - 1/266.7)

-1.3863 = (H/8.314)*(-3.837*10^-4)

H = 30100 J/mol

H = 30.1 KJ/mol

Answer: D

20)

Vapour pressure of solution generally increases with temperature as more molecule can escape into gaseous phase upon gaining energy

There are more gases in figure (3)

Answer: B

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