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An insulated tank initially contains 0.25 kg of a gas with an internal energy of 200 kJ/kg .Additional gas with an internal energy of 300 kJ/kg and an enthalpy of 400 kJ/kg enters the tank until the total mass of gas contained is 1 kg. What is the final internal energy(in kJ/kg) of the gas in the tank?
  • a)
    250
  • b)
    275
  • c)
     350
  • d)
    None of the above
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
An insulated tank initially contains 0.25 kg of a gas with an internal...
Given: Quantity of gas = 0.25 kg
Internal energy = 200kg
Additional gas = 300kg
Enthalpy entering the tank = 400kg
To Find: Internal energy of gas in the tank
Solution:
U = u1m1 + ( 1-m1 )h
U = 200 . 0.25 + ( 1 - 0.25) . 400 = 350
U = 350
Answer: The final internal energy is 350 kJ.
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Community Answer
An insulated tank initially contains 0.25 kg of a gas with an internal...
Correct Answer is 'B'
Mass (final) X U (final) = (Mass (initial) X U (initial)) + (Mass (added) X U (added))
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