Chemistry: Potassium-40 has a half-life of 1.277 x 109 years. after 1.022 x 1010 years, how much potassium-40 will remain from a 500.3-g sample? a. approximately 1.95 g b. approximately 3.91 g c. approximately 62.54 g d. approximately 71.47 g

Potassium-40 has a half-life of 1.277 x 109 years.

Ответ:

191600

03.01.2022

Chemistry

The correct answer is option A.

Explanation:

Half life of the potassium-40 sample = $t_{\frac{1}{2}}= 1.277\times 10^9 years$

N = amount left after time t = ?

Time = t = $1.277\times 10^9 years$

N_0 = initial amount = 500.3 g

$\lambda$ = rate constant

$\lambda =\frac{0.693}{t_{\frac{1}{2}}}=\frac{0.693}{ 1.277\times 10^9 years}= 0.5426\times 10^{-9} year^{-1}$

$\log N=\log N_o\times -\frac{\lambda t}{2.303}$

N = 1.95 g

Hence, the correct answer is option A.

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Ответ:

mmaglaya1

04.03.2020

Chemistry

I believe so

Explanation:

can you help me with my question Complete the following sentence: After we explained why we needed her in the play, she and joined our rehearsal A quaffed B. acquiesced C vengeance D. wreaked

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Potassium-40 has a half-life of 1.277 x 109 years. after 1.022 x 1010 years, how much potassium-40 will remain from a 500.3-g sample?
a. approximately 1.95 g
b. approximately 3.91 g
c. approximately 62.54 g
d. approximately 71.47 g

Ответ:

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