The Elementary Reaction $2 \mathrm { NO } _ { 2 }$

question 21

Multiple Choice

The elementary reaction
$2 \mathrm { NO } _ { 2 }$ (g) ? 2NO(g) + $\mathrm { O } _ { 2 }$ (g)
is second order in $\mathrm { NO } _ { 2 }$ and the rate constant at 515 K is 1.64 × 10^-2

$\mathrm { L } \mathrm { mol } ^ { - 1 }$ $s ^ { - 1 }$ .The reaction half-life at this temperature when $\left[ \mathrm { NO } _ { 2 } \right] _ { 0 }$ = 0.45 mol L^-1 is ________ s.

• A)13
• B)2.4 × 10^-2
• C)42
• D)7.4 × 10^-3
• E)1.4 × 10²

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Definitions:

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