3 years ago

50 POINTS!! PLEASE HELP!

Chemistry

1 answer:

inn [45]3 years ago

8 0

Okay so the answer will be.

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A scientist digs up sample of arctic ice that is 458,000 years old. He takes it to his lab and finds that it contains 1.675 gram

Fiesta28 [93]

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6.70 grams of krypton-81 was present when the ice first formed

Explanation:

Let use the below formula to find the amount of sample

$N= N_0(\frac{1}{2})^n$

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$n = \frac{t}{t_{\frac{1}{2}}}$

here

t = 458,000 years

$t_{\frac{1}{2}}$ = 229,000

$\frac{t}{t_{\frac{1}{2}}}$ = \ $\frac{ 458,000}{229,000}$

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Now substituting the values

$1.675 = N_0(\frac{1}{2})^{2.000}}$

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$N_0= \frac{1.675}{0.2500}$

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