Which of the following is an example of conservation of mass?
1 answer:
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Answer:
- <u>1,080 min</u>
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Explanation:
A <em>first order reaction</em> follows the law:
, where [A] is the concentraion of the reactant A.
Equivalently:
Integrating:
Half-life means [A]/[A₀] = 1/2, t = t½:
- t½ = ln (2) / k
That means that the half-life is constant.
The slope of the plot of ln [N₂O₅] is -k. Then k is equal to 6.40 × 10⁻⁴ min⁻¹.
Thus, you can calculate t½:
t½ = ln(2) / 6.40 × 10⁻⁴ min⁻¹
t½ = 1,083 min.
Rounding to 3 significant figures, that is 1,080 min.