First slide

Hess law of constant summation

Question

N₂ + O₂ → 2NO, ΔH = + Q₁
N₂ + 2O₂ → N₂O₄, ΔH = – Q₂
NO + 1/2O₂ → NO₂, ΔH = – Q₃
2NO₂ → N₂O₄, ΔH = – Q₄, then

Difficult

Solution

$\begin{array}{l} \,\,\,\,\,\frac{1}{{eq.(1)}} \Rightarrow 2NO \to {N_2} + {O_2},\Delta {H_1} = - {Q_1}\\ \,\,\,\,\,\,eq.(2) \Rightarrow {N_2} + 2{O_2} \to {N_2}{O_4},\Delta {H_2} = - {Q_2}\\ \underline {2 \times \frac{1}{{eq.(3)}} \Rightarrow 2N{O_2} \to 2NO + {O_2},\Delta {H_3} = + 2{Q_3}} \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,2N{O_2} \to {N_2}{O_4}\,\,\,,\,\Delta {H_4} = - {Q_4} = 2{Q_3} - {Q_1} - {Q_2} \end{array}$

$-Q_2=Q_1-2Q_3-Q_4$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App