Hass's law
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Posted by Rajat Bhadauria 6 years, 8 months ago
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Yogita Ingle 6 years, 8 months ago
This law states that the amount of heat evolved or absorbed in a process, including a chemical change is the same whether the process takes place in one or several steps.
Suppose in a process the system changes from state A to state B in one step and the heat exchanged in this change is q. Now suppose the system changes from state A to state B in three steps involving a change from A to C, C to D and finally from D to B. If q1, q2 and q3 are the heats exchanged in the first, second and third step, respectively then according to Hess’s law
q1 + q2 + q3 = q
Hess’s law is simply a corollary of the first law of thermodynamics. It implies that enthalpy change of a reaction depends on the initial and final state and is independent of the manner by which the change is brought about.
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