How do you solve these problems? Thank you How do you solve these problems? Than

Question

How do you solve these problems? Thank you
How do you solve these problems? Thank you 101 Questions for Pressure and Vapor Name Section 1. The accepted value for the enthalpy of vaporization of ethanol is ku mol Calculate the percent error experimental value Refer A regarding how particularly Comment on the relative size of your percent error. Give reasons for why it is large or small. 2. A substance has an enthalpy of vaporization of 35.76 ku mol n. If the vapor pressure is 62.53 22.5 °C, what is the temperature when the vapor pressure is 597.4 mmHg?

Explanation / Answer

1)
it is asking for some experimental value. That you should be knowing after doing the experiment

2)
Hvap = 35.76 KJ/mol = 35760 J/mol

P1 = 62.53 mm
T1 = 22.5 oC = (22.5+273) K = 295.5 K
P2 = 597.4 mm
T2 = ?
use:
ln (P2/P1) = (Hvap/R)*(1/T1 - 1/T2)
ln(597.4/62.53) = (35760/8.314)*(1/295.5 - 1/T2)
(1/295.5 - 1/T2) = 5.247*10^-4
T2 = 350 K
= (350-273) oC
= 77 oC

Answer: 77 oC

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