1.

Explain standard enthalpy of formation (Delta_(f)H^(@)).

Answer»

Solution :It is defined as the change in enthalpy accompanying the formation of one MOLE of a compound in its STANDARD state from the ELEMENTS in their standard states.
Example : `H_(2(G)) + (1)/(2)O_(2(g)) rarr H_(2)O_((l)) , Delta_(f)H^(@) = -285.8 kJ mol^(-)1`.


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