Bright Tutorials Bright Tutorials
ICSE Class 10 Chemistry Question 4 of 25

Gay Lussac's Law — Avogadro's Law — Mole Concept — Question 4

Back to all questions
4
Question

Question 4

224 cm3 of ammonia undergoes catalytic oxidation in presence of Pt to given nitric oxide and water vapour. Calculate the volume of oxygen required for the reaction. All volumes measured at room temperature and pressure.

Answer

[By Lussac's law]

4NH3+5O2⟶4NO+6H2O4 vol.:5 vol.⟶4 vol.:6 vol.\begin{matrix} \text{\scriptsize{4NH}}_3 & \text{\scriptsize{+}} & \text{\scriptsize{5O}}_2 & \longrightarrow & \text{\scriptsize{4NO}} & \text{\scriptsize{+}} & \text{\scriptsize{6H}}_2\text{\scriptsize{O}} \\ \text{\scriptsize{4 vol.}} & \text{\scriptsize{:}} & \text{\scriptsize{5 vol.}} & \longrightarrow &\text{\scriptsize{4 vol.}} & \text{\scriptsize{:}} & \text{\scriptsize{6 vol.}} \end{matrix}

To calculate the volume of oxygen required.

NH3:O24:5224:x\begin{matrix} \text{NH}_3 & : & \text{O}_2 & \\ 4 & : & 5 \\ 224 & : & x \end{matrix}

Therefore,

54×224=x⇒x=280 cm3\dfrac{5}{4} \times 224 = x \\[0.5em] \Rightarrow x = 280 \text{ cm}^3

Therefore, volume of oxygen required is 280 cm3.