Question

and vapor results. O e. It becomes compressed liquid. 1 ered A rigid tank contains 2.0 kg saturated liquid water at 40 C, then 25 kJ of heat was added to it while being stirred with a paddle which resulted in adding 30 kJ of wok, what is the final internal energy (kJ) of the water? f 1.00 stion Select one: O a. U2=473.66 kJ. b. U2=557.32 kJ. O c. U2=264.09 kJ. O d. U2=306.46 kJ. O e. U2=390.06 kJ. 2 ered At a specific temperature the enthalpy of a substance as saturated liquid and saturated vapor are given as 165.1 kJ/kg and 1858.4 kJ/kg, respectively, what is the enthalpy of vaporization (kJ/kg)? f 1.00 stion Select one: O abg c=1762.7 kJ/kg. O b. h=1670.9 kJ/kg. ig O c. h =1736.6 kJ/kg. O d. h=1647.2 kJ/kg. O e. h=1693.3 kJ/kg.

Answer 1

1) from steam table : AT T=40°c us = 167.53 kJ/kg Now ui = 2x 2x ug 335.06.kJ Q +25 kJ wa - 30kJ from first law of thermodynamics ♡ = Qu tw 25 Uz-, -30 ㅋ 25 C Un - 335.06-30 2 390.06 kJ option (e)

(2 briven, hr- 165. І KJ/kg - 1858-4 kJ/vЯ hga enthalpy of vaporization Now, Рg м3 ng ahl - 1859 .ч - 105 ) :. Рез - hka = 169 3. 3 кг/к у option (e)
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