Answer:
Density of unit cell ( rhodium) = 12.279 g/cm³
Explanation:
Given that:
The radius (r) of a rhodium atom = 135 pm
The atomic mass of rhodium = 102.90 amu
For a face-centered cubic unit cell,
![r = \dfrac{a}{2\sqrt{2}}](https://tex.z-dn.net/?f=r%20%3D%20%5Cdfrac%7Ba%7D%7B2%5Csqrt%7B2%7D%7D)
where;
a = edge length.
Making "a" the subject of the formula:
![a = 2 \sqrt{2} \times r](https://tex.z-dn.net/?f=a%20%3D%202%20%5Csqrt%7B2%7D%20%5Ctimes%20r)
![a = 2 \times 1.414 \times 135 \ pm](https://tex.z-dn.net/?f=a%20%3D%202%20%5Ctimes%201.414%20%5Ctimes%20135%20%5C%20pm)
a = 381.8 pm
to cm, we get:
a = 381.8 × 10⁻¹⁰ cm
However, recall that:
where;
mass of unit cell = mass of atom × numbers of atoms per unit cell
Also;
![mass\ of\ atom =\dfrac{ atomic \ mass}{Avogadro \ number}](https://tex.z-dn.net/?f=mass%5C%20%20of%5C%20atom%20%3D%5Cdfrac%7B%20atomic%20%5C%20mass%7D%7BAvogadro%20%20%5C%20%20number%7D)
![mass\ of\ atom =\dfrac{ 102.9}{6.023 \times 10^{23}}](https://tex.z-dn.net/?f=mass%5C%20%20of%5C%20atom%20%3D%5Cdfrac%7B%20102.9%7D%7B6.023%20%5Ctimes%2010%5E%7B23%7D%7D)
Recall also that number of atoms in a unit cell for a face-centered cubic = 4
So;
![mass \ of \ unit \ cell= \dfrac{102.90}{6.023 \times 10^{23}}\times 4](https://tex.z-dn.net/?f=mass%20%5C%20of%20%5C%20unit%20%5C%20cell%3D%20%5Cdfrac%7B102.90%7D%7B6.023%20%5Ctimes%2010%5E%7B23%7D%7D%5Ctimes%204)
mass of unit cell = 6.83380375 × 10⁻²² g
![Density \ of \ unit \ cell = \dfrac{6.83380375 \times 10^{-22}}{(381.8\times 10^{-10})^3}](https://tex.z-dn.net/?f=Density%20%20%5C%20of%20%20%5C%20unit%20%5C%20%20cell%20%3D%20%5Cdfrac%7B6.83380375%20%5Ctimes%2010%5E%7B-22%7D%7D%7B%28381.8%5Ctimes%2010%5E%7B-10%7D%29%5E3%7D)
Density of unit cell ( rhodium) = 12.279 g/cm³
The replacing of sodium hydroxide with potassium hydroxide
(KOH) to the reaction will least affect the organic product that forms.
Potassium hydroxide is an
inorganic compound with the formula KOH, and is commonly called caustic potash. Along with sodium hydroxide, this colorless
solid is a prototypical strong base.
Answer:
The answer is D (contains index fossils)
Explanation:
A solution is acidic if it’s pH is below 7
Answer: doing it right now
Explanation:
the picture