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Define the term 'enthalpy'. What will happen to the internal energy if work is done by the system ? |
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Answer» Solution :The enthalpy of REACTION is defined as the summation of internal energy of the reactin system, PLUS the product of pressrue and volume. It is given by : `H=U+PV` The first law of THERMODYNAMICS STATES that: `DeltaU=q+w` where U is the internal energy of the system Q is the heat that may flow into or out of the system and W is the work done on or by the system If work is done by the system then its internal energy must decrease. Work done by system is considered negative, THUS, `DeltaU=q-W.` |
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