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AysviL [449]
3 years ago
13

Nitrogen dioxide undergoes thermal decomposition according to the second-order reaction 2 NO2(g) 2 NO(g) + O2(g). When 0.500 M

NO2 is allowed to react for 90.0 seconds, its concentration falls to 0.0196 M. What is the half-life of the reaction when [NO2]0 = 0.500 M?
Chemistry
1 answer:
OlgaM077 [116]3 years ago
3 0

Answer:

half-life is 3.67s

Explanation:

The general law of the second-order reaction is:

\frac{1}{[A]}=\frac{1}{[A]_0}+kt

As after 90.0s, the concentration of NO2 decreases from 0.500M to 0.0196M:

\frac{1}{[0.0196]}=\frac{1}{[0.500]}+k*90.0s

49.02M⁻¹ = K*90.0s

0.5447M⁻¹s⁻¹ = K

Now, half-life, t1/2 is:

t_{1/2}=\frac{1}{K[A]_0}

Half-life is:

t(1/2) = 1 / (0.5447M⁻¹s⁻¹*0.500M)

<h3>half-life is 3.67s</h3>
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See attached => LeChatelier's Principle

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If one adds 0.1 mol of the weak acid hf (pk_a = 3.2) to a solution with a ph = 2, which species would be most abundant and how m
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F^{-} is most abundant and 6310 times more than HF.

<h3>What is a strong and weak acid?</h3>

When an acid is dissolved in water, all of its molecules disintegrate, making the acid powerful.

When an acid is dissolved in water, only a small number of its molecules disintegrate, making the acid weak. Strong acids have a lower pH than weak acids.

The powerful acids include perchloric acid, chloric acid, nitric acid, sulfuric acid, hydrobromic acid, and hydroiodic acid.

Given:

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pH=pka+log \frac{F^{-}}{HF} \\\\7=3.2+log\frac{F^{-}}{HF} \\3.8=log\frac{F^{-}}{HF}\\ \frac{F^{-}}{0.1}=10^{3.8} \\F^{-}=630.95 M

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F-:HF= 6309.57:1

Therefore, the most abundant is F^{-}and has 6310 times more than HF is F^{-}.

To know more about strong and weak acids, visit: brainly.com/question/12811944

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