Question

${\mathrm{N}}_2+3{\mathrm{H}}_2\to 2{\mathrm{NH}}_3$

State 3 pieces of information conveyed by the above reaction

State 3 pieces of information not conveyed by the above reaction

Answer 1

Chemical reaction:

The transformation of a chemical substance into a new chemical substance by making and breaking bonds between different atoms is known as Chemical Reaction.

Example: Nitrogen combines with hydrogen to form ammonia.

$\underset{\mathrm{Nitrogen}}{{\mathrm{N}}_2}+\underset{\mathrm{Hydrogen}}{3{\mathrm{H}}_2}\to \underset{\mathrm{Ammonia}}{2{\mathrm{NH}}_3}$

Part 1: The information available from the above reaction:

• The chemical equation gives the formulas and symbols of the reactants and products (As per the above equation the molecular formula of ammonia, water, and nitrogen is given. The Reactants are: Nitrogen and hydrogen and the Product is: Ammonia )
• The coefficient numbers in the equation show the number of molecules, formula units, or atoms of the species involved in the reaction. The coefficients also equal the number of moles of each reactant and product. (As per the above equation nitrogen and hydrogen combines in the ratio of 1:3 by volume)
• The type of reaction taking place (eg, synthesis, decomposition, displacement, or double displacement reaction). As the above reaction is concerned this is a synthesis/combination reaction; [i.e A synthesis reaction or direct combination reaction is a type of chemical reaction in which two or more simple substances combine to form a more complex product. The reactants may be elements or compounds, while the product is always a compound.]

Part 2: The information not available from the above reaction

Ideally, the equation should have been written as ${\mathrm{N}}_2\left(\mathrm{g}\right)+3{\mathrm{H}}_2\left(\mathrm{g}\right)\underset{\mathrm{Fe}/\mathrm{Mo}}{\overset{400-500°\mathrm{C}}{\rightleftharpoons }}2{\mathrm{NH}}_3\left(\mathrm{g}\right)+∆$

${\mathrm{NH}}_3$ is manufactured by Haber’s process. In this process, pure nitrogen and hydrogen gases react in the ratio of 1:3 by volume in $400°\mathrm{C}-500°\mathrm{C}$temperature, 200−900 atm pressure in presence of iron as a catalyst, and molybdenum as a promoter.

• The physical state of a substance, whether it is a solid, liquid, gas, or solution is not given in the original reaction.
• No special conditions are mentioned though they are required for a reaction to take place, using a catalyst or promoter(here iron and molybdenum)
• The reaction takes place at a high temperature and pressure which was also not mentioned( in $400°\mathrm{C}-500°\mathrm{C}$ temperature, 200−900 atm )