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InterviewSolution
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Define the following terms :(a) Enthalpy(b) Entropy |
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Answer» (a) Enthalpy : The amount of heat exchanged by a system with it's surroundings at constant pressure and temperature is called Enthalpy. Enthalpy (H) = U + PV Change in Enthalpy ∆H = ∆U + P∆U → It is a state function. ∆H = ∆HProducts – ∆Hreactants (b) Entropy : Entropy is taken as a Measure of disorder of molecules (or) randomness of the system. Greater the disorder of molecules in a system the higher is the Entropy. → It is a state function. → It depends on the temperature, pressure of the state. Entropy changed ∆S = qrev/T For a spontaneous process ∆S = +ve Solids (Low Entropy) liquids (Moderate Entropy) Gases (High Entropy) |
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