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dezoksy [38]
3 years ago
12

Complete the sentence. ______________ is thought to be most responsible for the salinity of the oceans.

Chemistry
1 answer:
Anettt [7]3 years ago
5 0
The best and most correct answer among the choices provided by your question is the fourth choice or letter D. Natural run-off from mountain ranges <span>is thought to be most responsible for the salinity of the oceans.

</span>After years and years of river inflow and evaporation, the salt<span> content of the lake water built up to the present levels. The same process made the seas </span>salty<span>. Rivers carry dissolved salts to the </span>ocean<span>. Water evaporates from the </span>oceans<span> to fall again as rain and to feed the rivers, but the salts remain in the </span>ocean<span>.</span>
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How many half-lives are required for the concentration of reactant to decrease to 1.56% of its original value?4247.56.56
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Answer:

6 half-lives are required for the concentration of reactant to decrease to 1.56% of its original value.

Explanation:

Using integrated rate law for first order kinetics as:

[A_t]=[A_0]e^{-kt}

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[A_0] is the initial concentration

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Concentration is decreased to 1.56 % which means that 0.0156 of [A_0] is decomposed. So,

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k=\frac {ln\ 2}{t_{1/2}}

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t = 6\times t_{1/2}

<u>6 half-lives are required for the concentration of reactant to decrease to 1.56% of its original value.</u>

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