At 298 K the enthalpy of formation of liquid water is -285.9 kJ/mol

At 298 K the enthalpy of formation of liquid water is -285.9 kJ/mol and that of steam -242.8 kJ/mol. The enthalpy of vapourisation of water is

Options

(a) 43.1 kJ/mol
(b) -43.1 kJ/mol
(c) 242.8 kJ/mol
(d) -242.8 kJ/mol

Correct Answer:

43.1 kJ/mol

Explanation:

ΔH(vap) = -242.8 – (-285.9) = 43.1 kJ/mol.

admin:

Related Questions

  1. Which of the following orders of ionic radii is correctly represented
  2. The gas molecules have r.m.s. velocity of its molecules as 1000 m/s
  3. In a lime kiln, to get higher yield of CO₂, the measure that can be taken is
  4. Which one of the following statements about transition elements is incorrect
  5. The internal energy of a system is the sum of