The vapor pressure of the liquid nh3 is measured at different temperatures. the following vapor pressure data are obtained.

calculate the enthalpy of vaporization (? hvap) in kj/mol for this liquid.

p1 = 234.2 mmhg t1 = 217.9 k
p2 = 522.6 mmhg t2 = 232.4 k

Explanation:

The expression for Clausius-Clapeyron Equation is shown below as:

Where,  

P is the vapor pressure

ΔHvap  is the Enthalpy of Vaporization

R is the gas constant (8.314×10⁻³ kJ /mol K)

c is the constant.

For two situations and phases, the equation becomes:

Given:

= 234.2 mmHg

= 522.6 mmHg

= 217.9 K

= 232.4 K

So,  

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.