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kiruha [24]
3 years ago
6

Which of the following elements is the most reactive?

Chemistry
2 answers:
Maksim231197 [3]3 years ago
4 0
<span>the following element that is most reactive </span>would be  Fluorine
Marta_Voda [28]3 years ago
4 0
I'm pretty sure its Bromine.
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If the half life of iridium-182 is 15 years, how much of a 3 gram sample is left after 2 half-lives?
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Answer:

D. 0.75 grams

Explanation:

The data given on the iridium 182 are;

The half life of the iridium 182, t_{(1/2)} = 15 years

The mass of the sample of iridium, N₀ = 3 grams

The amount left, N(t) after two half lives is given as follows;

N(t) = N_0 \left (\dfrac{1}{2} \right )^{\dfrac{t}{t_{1/2}} }

For two half lives, t = 2 × t_{(1/2)}

∴ t = 2 × 15 = 30

\dfrac{t}{t_{(1/2)}} = \dfrac{30}{15} = 2

\therefore N(t) = 3 \times\left (\dfrac{1}{2} \right )^2 = 0.75

∴ The amount left, N(t) = 0.75 grams

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