Question

How to indicate the temperature and pressure of a reaction?

Answer 1

Representation of Reaction Conditions

• The reaction conditions such as temperature, pressure, catalyst, etc are indicated by writing them above or below the arrow.
• Example: Haber's Process in the formation of ammonia.
• The complete reaction is:

$\underset{\mathrm{Dinitrogen}}{{\mathrm{N}}_2\left(\mathrm{g}\right)}+\underset{\mathrm{DIhydrogen}}{3{\mathrm{H}}_2\left(\mathrm{g}\right)}\stackrel{400-{450}^{°}\mathrm{C},700\mathrm{atm}}{\to }\underset{\mathrm{Ammonia}}{2{\mathrm{NH}}_3\left(\mathrm{g}\right)}$

• Here the temperature and pressure are mentioned above the arrow

Therefore, The reaction conditions must be represent above or below the arrow.