The gaseous reaction: $A (g) + n B (g) ⇌ m C (g)$ is represented by following curves. What is the value of $n + m$ ?

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Solution

From the graph,
Increase in concentration of C is thrice the decrease in concentration of A.

Decrease in concentration of B is twice the decrease in concentration of A.

$\Rightarrow$ 1 mole of A reacts with two moles B to give three moles of C.

So $n = 2, m = 3$ and $n + m = 2 + 3 = 5$

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