Energy level diagram for formation of water. Energy released is greater than energy required to break bonds so there is a net energy release. The reaction is exothermic. The amount of energy released is kcal minus kcal which equals kcal per mole of oxygen burnt or:
See Article History Hydrogen chloride, HCla compound of the elements hydrogen and chlorinea gas at room temperature and pressure. A solution of the gas in water is called hydrochloric acid. Hydrogen chloride is commonly prepared both on a laboratory and on an industrial scale by the reaction of a chloride, generally that of sodium NaClwith sulfuric acid H2SO4.
It is also produced by the reaction of some chlorides e. Hydrochloric acid is prepared by dissolving gaseous hydrogen chloride in water. Because of the corrosive nature of the acid, ceramic, glass, or sometimes tantalum apparatus is commonly used.
Hydrochloric acid is usually marketed as a solution containing 28—35 percent by weight hydrogen chloride, commonly known as concentrated hydrochloric acid.
Anhydrous liquid hydrogen chloride is available, but because heavy and expensive containers are required to store it, the use of hydrogen chloride in this form is limited. The gas is very soluble in water: Because of its great solubilitythe gas fumes in moist air.
A water solution containing Thus, hydrochloric acid is a strong acid. Gaseous hydrogen chloride reacts with active metals and their oxides, hydroxides, and carbonates to produce chlorides.
These reactions occur readily only in the presence of moisture. Completely dry hydrogen chloride is very unreactive. The reactions of hydrochloric acid are those of typical strong acids, such as: Hydrochloric acid also enters into chemical reactions characteristic of the chloride ion, such as reactions with various inorganic and organic compounds in which hydrochloric acid is used as a chlorinating agent and reactions with metals and their oxides in which complex chloride-containing ions are formed e.
The latter type of reaction accounts for the ease of solution of certain metals and metallic compounds in hydrochloric acid although they are slowly dissolved in other acids of equal strength e.
For this reason hydrochloric acid is used extensively in the industrial processing of metals and in the concentration of some ores. Hydrochloric acid is present in the digestive juices of the human stomach.
Excessive secretion of the acid causes gastric ulcers; a marked deficiency of it impairs the digestive process and is sometimes the primary cause of deficiency anemias.
Concentrated hydrochloric acid causes burns and inflammation of the skin.A balanced chemical equation is the equation in which number of reactants equals the number number of products. The balanced chemical equation for the formation of gaseous hydrogen fluoride is as follows.
Here, in this equation half molecule of reacts with half molecule of to give 1 molecule of HF. Thus, the sum of number of reactant molecules equals the number of product molecules. Therefore, it is a balanced equation. Nov 01, · For a simple chemical reaction, such as that of Eq.
(), we can immediately write down a balanced chemical equation. For more complex reactions the following systematic steps prove useful: 1. Set the number of moles of fuel equal to 1. r-bridal.come CO 2 with number of C from the fuel.
r-bridal.come H 2 O with H from the fuel. r-bridal.come O 2 from CO 2. Write a balanced molecular equation describing each of the following chemical reactions.
(a) Solid calcium carbonate is heated and decomposes to solid calcium oxide and carbon dioxide gas. (b) Gaseous butane, C 4 H 10, reacts with diatomic oxygen gas to yield gaseous . Oct 02, · Write a balanced chemical equation depicting the formation of one mole of C2H5OH5 from its elements in their standard states.
Express your answer as a chemical r-bridal.com: Resolved.
The standard formation reaction of a chemical compound has mole of the compound as its only product, and for reactants has only elements in their standard state. To write the equation of a standard formation reaction, follow these steps: 1.
Identify the elements in the compound. In this case, potassium dichromate contains oxygen, potassium, and chromium%(1). Stoichiometry: Baking Soda and Vinegar Reactions Teacher Version In this lab, students will examine the chemical reaction between baking soda and vinegar, and Students know how to describe chemical reactions by writing balanced equations.