Experimental applications of Hesss Law

The first 200 words of this essay...

Title: Experimental applications of Hess's Law

Objectives: 1) To determine the enthalpy change of reaction, by Hess's law.

2) To study the relationship between change in temperature and enthalpy change.

Introduction:

A Chemical reaction not only involved in a single steps reaction change also involved in a series of intermediate steps of changing. In this experiment are used the hydrochloric acid react with ammonia aqueous solution and the dissolving of solid ammonium chloride in water to determine the enthalpy change of the reaction. Reaction can be divided to two categories which is exothermic and endothermic reaction. Every reaction involved either exothermic or endothermic reaction. Just a simple example, when water in liquid state change to solid state is involved releases heat (exothermic reaction) in to surrounding. While when water in solid state change to liquid state involved in absorb heat (endothermic reaction) from surrounding.

Heats are produce when chemical reactions occur. In this experiment, the system is an isolated system which no exchanges heat and mass with surrounding. Hence, the amount of heat released or absorb from the reaction can be expressed as

In this experiment, the container that was used is