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Answer:

It will take 38298.5 years for 25% of its activity to disappear.

Explanation:

Given the half life = 8.3x10⁴ years = [tex]t_{\frac{1}{2} }[/tex]

We know that λ (disintegration constant) = log 2 /  [tex]t_{\frac{1}{2} }[/tex]

=> λ = log 2 / 8.3x10⁴

=> λ = 3.62 × 10⁻⁶

We know that λ = [tex]\frac{2.303}{t}[/tex] log [tex]\frac{N_{0} }{N}[/tex]

where N₀ = initial number of atoms

and N = final number of atoms

Here, N₀ = N₀ and N = 25%*N₀ = N₀/4

Let the time required for 25% of its activity to disappear be t

=>  3.62 × 10⁻⁶ = [tex]\frac{2.303}{t}[/tex] * log [tex]\frac{N_{0} }{\frac{N_{0}}{4} }[/tex]

=> 3.62 × 10⁻⁶ = [tex]\frac{2.303}{t}[/tex] * log [tex]\frac{4* N_{0} }{N_{0}}}[/tex]

=> 3.62 × 10⁻⁶ = [tex]\frac{2.303}{t}[/tex] * log 4

=> 3.62 × 10⁻⁶ = [tex]\frac{2.303}{t}[/tex] * 0.602

=> 6.01 × 10⁻⁵ = [tex]\frac{2.303}{t}[/tex]

=> t = 38298.5 years.

Therefore, it will take 38298.5 years for 25% of its activity to disappear.

Answer:

Explanation:

• [tex]LiAlH_{4}[/tex] is a strong, unselective reducing agent for polar double bonds.
• It is one of the most readily available sources of [tex]H^-[/tex] or hydrogen anion.  
• It can easily reduce aldehydes, ketones, esters, carboxylic acid chlorides, carboxylic acids and even carboxylate salts to alcohols.
• Whereas the amides and nitriles are reduced to amines.
• It is more powerful than the related reagent sodium borohydride owing to the weaker Al-H bond compared to the B-H bond.

Answer:

captivity

Explanation:

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Answer:

captivity is the correct answer

Answer:

When a list is embedded within another list, it is called a 'Nested List'.

Explanation:

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Answer:

Answer: When a list is embedded within another list, it is called a 'Nested List'.

Explanation:

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