Chemistry: Determine the half-life of potassium if in 3460 years a 200 g sample decayed into 25 g

Determine the half-life of potassium if in 3460 years

Ответ:

queenkimm26

30.12.2021

$M=m_o*\frac{1}{2}^\frac{t}{T}\\
M-mass\ aftter\ decay\\
m-initial\ mass\\
t-time\\
T-period(half-life)\\
25=200*\frac{1}{2}^\frac{3460}{T}|:200\\
\frac{1}{8}=(\frac{1}{2})^\frac{3460}{T}\\
(\frac{1}{2})^3=(\frac{1}{2})^\frac{3460}{T}\\
3=\frac{3460}{T}\\
T=1153\frac{1}{3}$

or easiest way
200g -----> 100g -------> 50g -----> 25g
We can that there were three decays.
1 decay ----------- x years
3 decays---------- 3460
$x=1153\frac{1}{3}$

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Ответ:

joeylozier15

24.04.2020

Chemistry

It can be either they can have a negative or positive charge more specifically negatively charged molecule would called an anion and a positive one would be cation.

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Determine the half-life of potassium if in 3460 years a 200 g sample decayed into 25 g

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