This is one of those (horrors!) Stoichiometry problems.
1. What is the Atomic Weight of Silicon
2. How many Moles of Silicon in 1 pound
3. Multiply Moles by Avogadros Number to get Number of Atoms.
As always, math is left as an exercise for the student.
There are approximately 5 x 10^22 silicon atoms in 1 cm^3 of material.
"silicon-oxygen" is essentially meaningless. Silica contains silicon and oxygen in the proportion 1:2, so is sometimes called "silicon dioxide", but it doesn't exist in the form of individual SiO2 molecules; they're bonded to each other in a large network.
2
Well take Si (as its own element, being silicon) and see how many atoms it has in that one unit, which would be 1 (notice that it has no number next to it) then see how many atoms are in the O2 (Oxygen) obviously it has 2 because of the number next to it. So you take the two numbers and add. 2+1=3. 3 atoms are present.
The chemical formula with 1 silicon and 2 oxygen atoms is SiO2, which represents silicon dioxide or silica.
There are approximately 5 x 10^22 silicon atoms in 1 cm^3 of material.
3.10 moles SiO2 (1 mole Si/1 mole SiO2)(6.022 X 1023/1 mole Si) = 1.87 X 1024 atoms of silicon =====================
"silicon-oxygen" is essentially meaningless. Silica contains silicon and oxygen in the proportion 1:2, so is sometimes called "silicon dioxide", but it doesn't exist in the form of individual SiO2 molecules; they're bonded to each other in a large network.
2
450 cc of breast silicone typically weighs around 1 pound.
a. There are 8 silicon atoms in each unit cell of a silicon crystal in a diamond cubic structure. b. The density of silicon is 2.33 g/cm^3, and the molar mass of silicon is approximately 28.09 g/mol. By using Avogadro's number, you can calculate that there are approximately 5 x 10^22 silicon atoms in one cubic centimeter.
SiO2 is a macromolecule. Each silicon atom is covalently bonded to four oxygen atoms and each oxygen atom is covalently bonded to two silicon atoms.
Well take Si (as its own element, being silicon) and see how many atoms it has in that one unit, which would be 1 (notice that it has no number next to it) then see how many atoms are in the O2 (Oxygen) obviously it has 2 because of the number next to it. So you take the two numbers and add. 2+1=3. 3 atoms are present.
The chemical formula with 1 silicon and 2 oxygen atoms is SiO2, which represents silicon dioxide or silica.
In a covalent bond, each silicon atom can bond with 4 hydrogen atoms. This is because silicon has 4 valence electrons to share with the 1 valence electron of each hydrogen atom. Therefore, 1 silicon atom can covalently bond with 4 hydrogen atoms.
1 pound of anything except precious metals or stones contains 16 ounces of the same stuff.
The chemical formula of silicon dioxide is SiO2. The atomic ratio oxygen/silicon is 2.