Benzyl acetate, C9H10O2, is a volatile compound associated with the aroma of str

Question

Benzyl acetate, C9H10O2, is a volatile compound associated with the aroma of strawberries. If the normal boiling point of benzyl acetate is 212 °C, what is the boiling point when the pressure is lowered to 270. torr? Hvap = 55.5 kJ/mol

Question 7 Benzyl acetate, CoHuoo2, is a volatile compound associated with the aroma of strawberries. If the normal boiling point of benzyl acetate is 212 oc, what is the boiling point when the pressure is lowered to 27o. torr? vap 55.5 kJ/mol A. 156 °C B. 178°C C. 197 °C D. 224 °C

Explanation / Answer

At normal boiling point , P = 760 torr

So, we have:

T1 = 212.0 oC =(212.0 + 273)K = 485.0 K

P1 = 760.0 torr

P2 = 270.0 torr

Hvap = 55.5 KJ/mol = 55500.0 J/mol

use:

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

ln(270.0/760.0) = (55500.0/8.314)*(1/485.0 - 1/T2)

-1.03 = 6675.49*(1/485.0 - 1/T2)

T2 = 451

= (451-273) oC

= 178 oC

Answer: 178 oC

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