Question 5) Dinotrogen oxide is a moderately stable compound used as an anesthet

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Question 5) Dinotrogen oxide is a moderately stable compound used as an anesthetic. However, at high temperature it decomposes according to the following equation.

B. concentration of the catalyst D. surface area in contact Q5. (N98) Dinitrogen oxide is moderately stable compound used as an anesthetic. However, at high temperature it decomposes according to the following equation. kgthemic H =076 kJmol-1 N2O (g) N2(g) + ½ O2 (g) The rate expression for the reaction is R = k [N20(g) Explain qualitatively why the value of the rate constant, k increases with increasing temperature. 6. (a) The rate constant, K, for any reaction is related to the activation energy, Ea, by the Arrhenius equation.

Explanation / Answer

* Although the Dinitrogen oxide is a moderately stable compound but the value of rate constant K increaseswith increase in temperature because a greater fraction of molecules exceeds the activation energy at high temperature and this leads to greater frequency of effective collision and a faster reaction rate.

* As per the Arrhenius Equation, temperature and Activation Energy are part of Rate Constant (K).

Arrhenius Equation:

K = Ae-Ea/RT    or ln(K) = ln (A) - Ea/RT Where: K is rate constant

A is frequency factor

Ea is Activation energy and T is temperature.

The Arrhenius equation shows us that:

• a higher fraction of collisions with correct orientation leads to larger value of A and a faster rate

. e-Ea/RT is the fraction of collisions exceeding the activation energy

• as Ea increases, e-Ea/RT decreases and the rate is slower

• as T increases, e-Ea/RT increases and the rate is faster

•Therefore, the fraction Ea/T controls rate: the smaller this fraction, the faster the rate

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