The vapor pressure of H2O (l) at 353 K is 532 mm Hg. The external pressure on H2O (l) taken in a cylinder fitted with frictionless movable piston initially containing 0.9 L (=0.9 kg) of H2O (l) at 33 K is increased to 1 atm. Temperature remained constant. Now, heat is supplied keeping pressure constant till 0.45 L of H2O (l) (=0.45 kg) is evaporated to form H2O (g) at 373 K. carefully observe the diagrams provided and form given data, answer the following questions Given:
Specific heat of H2O = 4.2J/gm⁰C
Use Hvap at 373 K and 1 atm =+40 kJ/mol
1L atm = 100 Joule
1 atm = 760 mm Hg
R = 8 Joule/mole K
(Assume internal energy of liquid to be dependent only on temperature).
Total change in enthalpy going from state 1 to 3 (kJ)?
(A) 75.6
(B) 1075.6
(C) 1001
(D) 74.6
