from 2. Happy day after Valentines day Did you enjoy your chocolate? Good, now W

Question

from 2. Happy day after Valentines day Did you enjoy your chocolate? Good, now Wiki the colon and bythe sbody odor). It is also suspected to be found in milk chocolate produeed ipedia: Butryic acid is a product of anaerobic fermentation including in by the Hershey pro acid is pressure cess, or added to imitate the flavour of Hersheys chocolate utyris f the vapor of this stinky organic acid is 0.74 kPa at S0.0 C and 9.12 kPa at 370C(hody pointsafue) then determine from this data the heat of vaporization of butyrie acid. Go s present in, and is the main distinctive smell of, human vomit points)

Explanation / Answer

we can use Clausius-Clapeyron equation to find the heat of vapourization.

ln (P2/P1) = {-Del Hvap / R }(1/T2 - 1/T1)

The absolute temperature, T1 = (37+273.2) K = 310.2 K

T2 =  (50+273.2) K = 323.2 K

From the given data we know, P1 = 9.12 kPa and P2 = 0.74 kPa

Substituting all the values we get,

ln (0.74/9.12) ={-Del Hvap / R }(1/323.2- 1/310.2)

or, ln(0.0811) = {-Del Hvap / R }(0.00309- 0.00322)

or, -2.5121 = {-Del Hvap / R }(-0.00013)

or, Del Hvap / R = -2.5121/0.00013 = -19323.846 K

The gas constant R = 8.314 J mol-1 K-1

Substituting the value of R we gwt,

Del Hvap =  -19323.846 K x 8.314 J mol-1 K-1 = 160658.4556 J mol-1 = 160.66 kJ/mol

or

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