Answer: 9.27 g of Na
Explanation:Please see attachment for explanation
7.32 moles of Chromium is present in 4.41 × 10²⁴ atoms.
<h3>How to find the number of moles ?</h3>
Number of moles = ![\frac{\text{Given number of atoms}}{\text{Avogadro's Number}}](https://tex.z-dn.net/?f=%5Cfrac%7B%5Ctext%7BGiven%20number%20of%20atoms%7D%7D%7B%5Ctext%7BAvogadro%27s%20Number%7D%7D)
<h3>What is Avogadro's Number ?</h3>
Avogadro's number is the number of particles in one mole of substance. 6.022 × 10²³ is known as Avogadro's Constant / Avogadro's Number.
Avogadro's Number = 6.022 × 10²³
Now put the values in above formula we get
Number of moles = ![\frac{\text{Given number of atoms}}{\text{Avogadro's Number}}](https://tex.z-dn.net/?f=%5Cfrac%7B%5Ctext%7BGiven%20number%20of%20atoms%7D%7D%7B%5Ctext%7BAvogadro%27s%20Number%7D%7D)
= ![\frac{4.41 \times 10^{24}}{6.022 \times 10^{23}}](https://tex.z-dn.net/?f=%5Cfrac%7B4.41%20%5Ctimes%2010%5E%7B24%7D%7D%7B6.022%20%5Ctimes%2010%5E%7B23%7D%7D)
= 7.32 moles
Thus from the above conclusion we can say that 7.32 moles of Chromium is present in 4.41 × 10²⁴ atoms.
Learn more about the Avogadro's Number here: brainly.com/question/1581342
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Answer:
The reason they don't react is because Elements with full octets are stable, the Elements with no unpaired electrons do not react at all in the decay.
substitute: <span><span>t<span>1/2</span></span>=<span><span>ln(2)</span>k</span>→k=<span><span>ln(2)</span><span>t<span>1/2</span></span></span></span>
Into the appropriate equation: <span>[A<span>]t</span>=[A<span>]0</span>∗<span>e<span>−kt</span></span></span>
<span>[A<span>]t</span>=[A<span>]0</span>∗<span>e<span>−<span><span>ln(2)</span><span>t<span>1/2</span></span></span>t</span></span></span>
<span>[A<span>]t</span>=(250.0 g)∗<span>e<span>−<span><span>ln(2)</span><span>3.823 days</span></span>(7.22 days)</span></span>=67.52 g</span>