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Factors Affecting the Rate of a Chemical Reaction

The reaction ...

Question

The reaction $2 H_{2}$ (g) + 2NO (g) $\to$ 2H $_{2}$ O (g) + N $_{2}$ (g) is first order in $H_{2}$ and second order in NO. The rate constant of the reaction at a certain temperature is 0.42 $M^{- 2}$ $s^{- 1}$ . calculate the rate when $[H_{2}]$ = 0.015 M and [NO] = 0.025 M.

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Solution

$2 H_{2} + 2 N O \to 2 H_{2} O + N_{2}$

$- \frac{d R}{d t} = k [H_{2}] [N O]^{2}$

$K = 0.42 M^{- 2} 5^{- 1}$

$- \frac{d R}{d t} = 0.42 \times 0.015 \times 0.025$

$= 0.0001575 m / s$

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