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hammer [34]
2 years ago
8

The reaction 3NO ---> N2O + NO2 is found to obey the rate law Rate = k[NO]^2^. If the first half-life of the reaction is foun

d to be 2.0 s, what is the length of the fourth half-life.
Chemistry
1 answer:
agasfer [191]2 years ago
6 0

Answer:

8.0 s.

Explanation:

Hello,

In this, case, by knowing that the half-life time allows as to compute the rate constant in terms of the initial concentration as shown below:

k=\frac{1}{[NO]_0*t_{/2}} = \frac{1}{[NO]_0*2.0}=\frac{1}{2[NO]_0}

Therefore, the fourth half-life time implies that the concentration is 1/16 the initial one, therefore:

t_{1/2}^{4th}=\frac{1}{k/16}= 8.0s

That is analyzed considering that if the initial concentration is 1M the first half-time is at 0.5M, the second at 0.25M, the third at 0.125M and the fourth at 0.0625M which is 16 times smaller than 1M.

Best regards.

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3 years ago
If i have 8 L of 0.25 M solution, how many miles of MgCl2 are present
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Answer:

2 moles

Explanation:

The following were obtained from the question:

Molarity = 0.25 M

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Mole =?

Molarity is simply defined as the mole of solute per unit litre of solution. It is represented mathematically as:

Molarity = mole of solute/Volume of solution.

With the above equation, we can easily find the number of mole of MgCl2 present in 8 L of 0.25 M MgCl2 solution as follow:

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0.25 = mole of MgCl2 /8

Cross multiply to express in linear form

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3 years ago
How are solutions related to mixtures?
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3 years ago
What is the acceleration of an object that goes from 3 m/s to 5 m/s in 8 s?
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