state and explain hess,s law of constant heat summation with suitab

1.	state and explain hess,s law of constant heat summation with suitable example.what are it,s application
Answer» ong>Explanation: It states that "Overall the ENTHALPY change for a reaction is EQUAL to sum of enthalpy changes of INDIVIDUAL steps in the reaction". Ex: 2H2 + N2 gives N2H4. ∆H=+95.4KJ N2H4 + H2 gives 2NH3. ∆H=-187.6KJ 3H2 +H2 gives 2NH3. ∆H=-92.2KJ---eqn3 eqn3 gives TOTAL enthalpy change of reaction. APPLICATION: The Hess's law has been usefull to calculate the enthalpy changes for the REACTIONS with their enthalpies being not known experimentally.

state and explain hess,s law of constant heat summation with suitable example.what are it,s application

Answer»

ong>Explanation:

It states that

"Overall the ENTHALPY change for a reaction is EQUAL to sum of enthalpy changes of INDIVIDUAL steps in the reaction".

Ex:

3H2 +H2 gives 2NH3. ∆H=-92.2KJ---eqn3

eqn3 gives TOTAL enthalpy change of reaction.

APPLICATION:

The Hess's law has been usefull to calculate the enthalpy changes for the REACTIONS with their enthalpies being not known experimentally.