TLS Online TPP Program

#Question id: 20250


What is the work done against the atmosphere when 25 grams of water vaporizes at 373 K against a constant external pressure of 1 atm ? Assume that steam obeys perfect gas laws. Given that the molar enthalpy of vaporization is 9.72 kcal/mole, what is the change of internal energy in the above process ?

#XL - P Chemistry
  1. 1294.0 cals, 11247 cals
  2. 921.4 cals, 11074 cals
  3. 1029.4 cals, 12470.6 cals
  4. 1129.3 cals, 10207 cals