The elementary reaction no2 (g) → 2no (g) + o2 (g) is second order in no2 and the rate constant at 690 k is 1.27 × 101 m-1s-1. the reaction half-life at this temperature when [no2]0 = 0.45 m is s. the elementary reaction no2 (g) → 2no (g) + o2 (g) is second order in no2 and the rate constant at 690 k is 1.27 × 101 m-1s-1. the reaction half-life at this temperature when [no2]0 = 0.45 m is s. 0.17 18 5.7 0.054 0.079

Explanation:

Hello,

At first, we must consider the rate law as:

The supposition of half-life, leads to

Thus, after the algebraic arrangement, we get:

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in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

if you're asking what comes out, it's steam.