Question

The measured value of the latent heat of vaporization of helium (at 1 atm) is

84 J/mol. Use this to estimate the binding energy of helium atoms in the liquid.
a. 2.6 x 10-6 eV
b. 3.6 x 10-4 eV
c. 5.1 x 10-4 eV
d. 8.6 x 10-3 eV
e. 3.6 x 10-2 eV

Answer 1

d. 8.6 x 10-3 eV

Step-by-step explanation:

Binding energy is energy that binds two atoms together . Energy is required to separate them . In the process of evaporation , energy is required to separate each molecules/ atoms of liquid so that they are separated and then get evaporated . That is why latent heat of evaporation is required .

1 mole of helium will contain 6.02 x 10²² atoms of it .

binding energy per atom = 84 / 6.02 x 10²² J

= 13.953 x 10⁻²² J

= 13.953 x 10⁻²² / 1.6 x 10⁻¹⁹ eV .

= 8.6 x 10⁻³ eV