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Sindrei [870]
3 years ago
6

Solve whats on the image PLEASE 50 POINTS

Chemistry
2 answers:
Lorico [155]3 years ago
5 0
the answer is 50%!!!!
notsponge [240]3 years ago
4 0

Answer:

The answer is 99.34 percent

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Technetium has a half-life of six hours. If you obtain 100g of a pure technetium sample, after 18 hours how much of the pure sub
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Answer:

After 18 hours, the amount of pure technetium that will be remaining is 12.5 grams

Explanation:

To solve the question, we note that the equation for half life is as follows;

N(t) = N_0 (\frac{1}{2} )^{\frac{t}{t_{1/2}}

Where:

N(t) = Quantity of the remaining substance  = Required quantity

N₀ = Initial radioactive substance quantity  = 100 g

t = Time duration  = 18 hours

{t_{1/2} = Half life of the radioactive substance  = 6 hours

Therefore, plugging in the values, we have;

N(t) = 100 (\frac{1}{2} )^{\frac{18}{6}} = 100 (\frac{1}{2} )^{3} =  \frac{100 }{8} = 12.5 \ grams

Therefore, after 18 hours, the amount of pure technetium that will be remaining = 12.5 grams.

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4 years ago
I tried finding the answer to this time and time again. I cannot find it. I hope someone can help me. What does photochemical sm
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3 years ago
Which of these is correct?
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Explanation:

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The difference between isotopes for the same element will be found in the atoms'
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C number of neutrons
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Explanation:

A line-angle formula with six vertices and a circle inscribed corresponds to the compound known as benzene.

Further, according to the IUPAC standards for naming benzene derivatives, you must first number the position of the substituent. In this case, the substituents (chloros) are located at the positions 1 and 4; also, for the benzene derivatives when they have 2 substituents and the positions are 1 and 4, this configuration is known as <em>para </em>or <em>p </em>configuration.

Additionally, this compound has 2 substituents (chloros) so you have to indicate this number (di).

Therefore, the correct answer is C. p-dichlorobenzene and 1,4-dichlorobenzene.

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3 years ago
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