Question

For the chemical reaction
N₂ (g) + 3H₂ (g) ⇄ 2NH₃ (g)
the correct option is :
(1) (-1/3) d[H₂]/dt = (-1/2) d[NH₃]/dt
(2) -d[N₂]/dt = 2 d[NH₃]/dt
(3) -d[N₂]/dt = (1/2) d{NH₃]/dt
(4) 3 d[H₂]/dt = 2 d[NH₃]/dt

Answer 1

Correct answer - (1)

Step by step explanation:

Rate of reaction;

"It is the change in the concentration of any one reactant or product in unit tome."

Rate of reaction is expressed in the following formulas.

$\bold{Rate\,of\,reaction=\frac{Increase\,in\,product\,concentration}{Change\,in\,time}}$

$\bold{Rate\,of\,reaction=\frac{decrease\,in\,reactant\,concentration}{Change\,in\,time}}$

Reaction rate is depends upon the positive quantity.

The given chemical reaction is as follows.

$\bold{N_{2}(g)+3H_{2}(g)\Leftrightarrow 2NH_{3}(g)}$

The rate of reaction can be expressed by as follows.

Decrease the reactant concentration

$\bold{Rate=-\frac{d[N_{2}]}{dt}=-\frac{1}{3}\frac{d[H_{2}]}{dt}}$

Increase the product concentration:

$\bold{Rate=+\frac{1}{2}\frac{d[NH_{3}]}{dt}}$

Hence, the correct option is -1.

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