Question

50. Write the molecular equation for the following word equation.
$\mathrm{Phosphorus}+\mathrm{Oxygen}\to \mathrm{Phosphorus}\mathrm{pentoxide}$

Answer 1

Step 1:- Representation of elements

Phosphorus is denoted by P and Oxygen is denoted by O_{2 .}

Step 2:- Write the molecular equation

When phosphorous reacts with oxygen, it produces phosphorous pentoxide (P₂O₅).

Therefore, the molecular equation is written as:

$\underset{\mathrm{Phosphorus}}{\mathrm{P}\left(\mathrm{s}\right)}+\underset{\mathrm{Oxygen}}{{\mathrm{O}}_2\left(\mathrm{g}\right)}\to \underset{\mathrm{Phosphorus}\mathrm{pentoxide}}{{\mathrm{P}}_2{\mathrm{O}}_5\left(\mathrm{s}\right)}$

After balancing the above reaction, the balanced molecular equation can be written as:

$\underset{\mathrm{Phosphorus}}{4\mathrm{P}\left(\mathrm{s}\right)}+\underset{\mathrm{Oxygen}}{5{\mathrm{O}}_2\left(\mathrm{g}\right)}\to \underset{\mathrm{Phosphorus}\mathrm{pentoxide}}{2{\mathrm{P}}_2{\mathrm{O}}_5\left(\mathrm{s}\right)}$