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Ques 1) Water is brought under a pressure of 1 atm. When an electric current of 0.5 A from a 12 V supply is passed for 300 sec through a resistance in thermal contact with it, it is found that 0.789 g of water is vaporized. Calculate the molar internal energy and enthalpy changes at the boiling point.
Ques 2) One mole of an ideal diatomic gas underwent an adiabatic expansion from 298 K, 15 atm, and 5.25 L to 2.50 atm against a constant external pressure of 1 atm. What is the final temperature of the system ?
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3 Answers
1ans 2)
PV^{\gamma }=constant
TV^{\gamma-1 }=constant
using the second relation we can determine the final temperature.