$H_{2}$ $+$ $I_{2}$ $=$ $2 H I$ . What will be the instantaneous rate of the reaction in terms of product?

\frac{1}{2}

\frac{d [H I]}{d t}

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\frac{1}{2}

\frac{d [H I]}{d t}

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\frac{d [H I]}{d t}

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\frac{d [H I]}{d t}

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Solution

The correct option is A $\frac{1}{2}$ $\frac{d [H I]}{d t}$
Since the product concentration increases over time, there will be a positive sign in front of the rate expression. There are two moles of $H I$ , so to get a unique value, or to bring all the molecules on the basis of same numerical value, we divide the instantaneous rate by the stoichiometric co-efficient. Hence the rate will be $\frac{1}{2}$ $\frac{d [H I]}{d t}$

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Similar questions

Consider the chemical reaction,
$N_{2} (g) + 3 H_{2} (g) \to 2 N H_{3} (g)$
The rate of this reaction can be expressed in terms of time derivatives of concentration of $N_{2} (g), H_{2} (g) o r N H_{3} (g)$ . Identify the correct relationship amongst the rate expressions.

Q. For the reaction:

2 H I \to H_{2} + I_{2} .

the expression

\frac{- 1}{2} \frac{d (H I)}{d t}

represents:

Consider the chemical reaction

$N_{2} (g) + 3 H_{2} (g) ⟶ 2 N H_{3} (g) .$

The rate of this reaction can be expressed in terms of time derivatives of the concentration of $N_{2} (g), H_{2} (g), o r N H_{3} (g) .$ Identify the correct relationship among the rate expressions.

Q. For the reaction

I_{2} + 2 S_{2} O_{3}^{2 -} \to S_{4} O_{6}^{2 -} + 2 I^{⊖}

\frac{- d [I_{2}]}{d t} = - \frac{1}{2} \frac{d [S_{2} O_{3}^{2 -}]}{d t}

II.

\frac{- d [I_{2}]}{d t} = - 2 \frac{d [S_{2} O_{3}^{2 -}]}{d t}

III.

\frac{- d [I_{2}]}{d t} = - 2 \frac{d [I^{⊖}]}{d t} \frac{d [S_{2} O_{3}^{2 -}]}{d t}

IV.

\frac{d [S_{4} O_{6}^{2 -}]}{d t} = \frac{1}{2} \frac{d [I^{⊖}]}{d t}

The correct option is:

Q. The rate of reaction is expressed as rate

= \frac{1}{2} \frac{d [C]}{d t} = - \frac{1}{3} \frac{d [D]}{d t} = \frac{1}{4} \frac{d [A]}{d t} = - \frac{d [B]}{d t}

. The reaction is

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H2+I2=2HI. What will be the instantaneous rate of the reaction in terms of product?

$H_{2}$ $+$ $I_{2}$ $=$ $2 H I$ . What will be the instantaneous rate of the reaction in terms of product?