5(c)
The equation :
4NH3 + 5O2 ⟶ 4NO + 6H2O,
represents the catalytic oxidation of ammonia. If 100 cm3 of ammonia is used calculate the volume of oxygen required to oxidize the ammonia completely.
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[By Lussac's law]
$$\begin{matrix} 4\text{NH}_3 & + & 5\text{O}_2 &\longrightarrow & 4\text{NO} & + & 6\text{H}_2\text{O} \\ 4 \text{ vol.} & : & 5 \text{ vol.} & \longrightarrow & 4\text{ vol.} \end{matrix}$$
To calculate the volume of oxygen required :
$$\begin{matrix}\text{NH}_3 & : & \text{O}_2 \\ 4 \text{ vol.} & : & 5 \text{ vol.} \\ 100 \text{ cm.}^3 & : & \text{x} \end{matrix}$$
$\therefore x = \frac{5}{4} \times 100 = 125 \text{ cm.}^3$
Hence, volume of oxygen required = 125 cm3