Water is boiled under a pressure of 1.0 atm. When an electric current of 0.50 A from a…
Chemistry · JEE Main · NTA Exams — Chemical Thermodynamics
Water is boiled under a pressure of 1.0 atm. When an electric current of 0.50 A from a 12V supply is passed for 300 s through a resistance in thermal contact with it, it is found that 0.789 g of water is vaporised. Calculate the molar internal energy and enthalpy changes at boiling point (373.15 K).
- \(40.6 \mathrm{~kJ} \mathrm{~mol}^{-1}, 37.5 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
- \(41.06 \mathrm{~kJ} / \mathrm{mol}^{-1}, 37.96 \mathrm{~kJ} / \mathrm{mol}^{-1}\)
- \(42.5 \mathrm{~kJ} \mathrm{~mol}^{-1}, 45.5 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
- \(40.92 \mathrm{~kJ} / \mathrm{mol}^{-1}, 38.4 \mathrm{~kJ} / \mathrm{mol}^{-1}\)
Answer
(B) 41.06 ~kJ / mol ^ -1 , 37.96 ~kJ / mol ^ -1
Sign up free on Edukali to view the step-by-step worked solution and practice thousands of similar questions.
Related practice questions
- The standard enthalpies of formation of HCl(g), H(g) and Cl(g) are –92.2, 217.7 and 121.4 kJ mol –1…
- At 25°C and 1 atm pressure, the enthalpy of combustion of benzene (l) and acetylene (g) are –3268 kJ mol –1…
- The standard enthalpy of formation of NH 3 is - 46.0 kJ mol -1 . If the enthalpy of formation of H 2 from its…
- For the reaction : C _ 2 H _ 4 ( ~g )+3 O _ 2 ( ~g ) 2 CO _ 2 ( ~g )+2 H _ 2 O ( ) at 298 K, ∆U = – 1415 kJ…
- For silver, C p (JK -1 mol -1 ) = 23 + 0.01 T. If the temperature (T) of 3 moles of silver is raised from 30…
- In a system where ∆E = –51.0 kJ, a piston expanded against a p ext of 1.2 atm giving a change in volume of…
- If the bond dissociation energies of XY, X 2 and Y 2 (all diatomic molecules) are in the ratio of 1 : 1 : 0.5…
- An ideal gas is allowed to expand form 1 L to 10 L against a constant external pressure of I bar. The work…
More Chemical Thermodynamics questions · Browse all practice questions