Crop and straighten your question 1)The Handhook of Cheeisary and Pysis ells s oameaty d CCboils norly a 767 C s...

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Crop and straighten your question 1)The Handhook of Cheeisary and Pysis ells s oameaty d CCboils norly a 767 C s andad lar ha

1)The Handbook of Chemistry and Physics tells us, correctly, that CCI, boils normally at 76.7 °C, but its standard molar enth

Answer 1

Answer #1

At boiling point , Vapor pressure (P₁) = 1 atm.

Boiling point (T₁) = 76.7 + 273 = 349.7 K

at , T₂ = 15.8+273 = 288.8 K , vapor pressure (P₂) = 0.0987 atm

Clausius clapyeron equation is

ln( $\frac{P_1}{P_2}$ ) = Hvap R × $(\frac{1}{T_2} - \frac{1}{T_1})$

Or, ln ( 0,0987 ) = Hvap R × ( (288.8 349.7

Or, 2.325 = Hvap R × (0.00346 - 0.00286)

Or, 2.315 = Hvap R × 0.0006

Or, Hvap R = (2.315/0.0006)

Or, Hvap R = 3858

Or, Hvap = 3858× R

Or, Hvap = 3858×8.314

Or, Hvap = 32078Jmol^-1

Or, Hvap = 32.078 KJ mol^-1

Hence, calculated enthalpy of vaporisation is more close to 31.9 KJ/mole.

Therefore calculated result supports that enthalpy od vaporisation is 31.9 KJ mol^-1

[ R = 8.314 J mol^-1 K^-1]

Answer 2