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The four laws are the zeroth law, the first law, the second law, and the third law. These laws are universally valid to any thermodynamic system and are described as follows:
In chemistry, our concern is not with the absolute value of enthalpy but rather the change in the enthalpy. The absolute enthalpy cannot be estimated directly since the value of the absolute internal energy cannot be reckoned for real systems. Further, in chemistry and thermodynamics, we are interested in measuring the change in enthalpy, not its absolute value.
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