What is the boiling point of cyclohexane at 620 mmhg? can you show calculations?

Boiling point of cyclohexane at 620 mm Hg is 440.6 K

Explanation:

According to clausius-clapeyron equation for a liquid-vapour equilibrium-

where and are vapor pressure of liquid at and temperature respectively

is the molar enthalpy of vaporization of liquid

Let's assume is equal to standard molar enthalpy of vaporization of a liquid

For cyclohexane, standard molar enthalpy of vaporization is 32.83 kJ/mol

Here, = 620 mm Hg, is 450.8 K (boiling point of cyclohexane) and is 760 mm Hg

So,

So,

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol