hess's Law

1. BY MUHAMMAD MUJEEB
MUHAMMAD NABEEL

2.  HISTORY.
 HESS’S LAW.
 EXAMPLES.
 APPLICATION.{ with Examples }
 Determination of heat of formation.
 Determination of Enthalpy of transition.
 Determination of Standard heat of reaction

4.  GERMAIN HENRICH HESS’S WAS BORN ON
AUGUST 07 1802 IN GENEVA
SWITZERLAND.
 After practicing medicine for several year
in russia .
 Has become professor of chemistry in
1830.
 His studies of heat in chemical reaction
formed the foundation of
thermochemistry.

5.  Thermochemistry is a branch of chemistry
which deals with the thermal changes
accompaying physical & chemical
transformation.
 Aim of chemistry is not only determine he
absorption or emmission of energy but also
to developed the method for calculating
these thermal changes with experiments.

8.  The heat of transition of one allotropic form
to another allotropic form is called enthalpy
of transition.

9.  The standard enthalpy of reaction is the
change in enthalpy that occur in a system
when one mole of matter is transferred by a
chemical reaction under standard condition ;
such as temperature and pressure.