Wiki User
∙ 11y agothe weight of a grain of salt is about 5.85x10-5 grams
Approximately how many atoms are in a grain of salt?
Asked by: Roger Bevels (teacher)
Answer
This is mainly an estimation problem -- there is no exact measure of how big a 'grain of salt' is. So, the answer will be only correct within an order of magnitude (a factor of 10).
The first step is to estimate how large a grain of salt is. I spilt some salt onto the table, and visually estimated that about three grains of salt placed end-to-end are about a millimeter long. (Your mileage may vary.) So, as a simple estimate, I'll assume that salt grains are 0.3 millimeters long.
The next assumption is that salt crystals are cubes, with 0.3 millimeter sides. In fact they tend to be, since the crystal structure of NaCl is cubic. However, most have broken corners, but we will ignore that.
The density of NaCl is about 2.165 gr/cm3. With the cube assumption, we find that a grain of salt is about 5.85x10^-5 grams. (We could have arrived at this result by weighing an individual grain, or by weighing a gram and then counting the number of grains in it, but this is left as an exercise for the PhysLink reader.)
The next thing we need is the weight of a 'salt atom'. There is no such thing as a salt atom, it consists of Na (sodium) and Cl (chlorine) atoms. So, we need to use an average value. The Atomic Mass of Na is 23 gr per mole, and the atomic mass of Cl is 35.5 gr per mole. So, the average 'atomic weight of salt' is 29.25 grams per mole.
Now it is a simple matter to find how many atoms there are in a grain of salt. (Note that one mole contains Avogadro's number of atoms, which is 6.02x1023.)
So a grain of salt contains about:
5.85x10-5 gr/ (29.25 gr / 6.02x1023) = 1.2x1018 atoms, half of which are sodium atoms. (The other half is chlorine atoms, of course.)
Answered by: Yasar Safkan, Ph.D. M.I.T., Software Engineer, Istanbul, Turkey
Wiki User
∙ 11y agoAssuming a grain of salt is sodium chloride (table salt) with a density of 2.16 g/cm^3, the volume of a grain of salt is 0.3 mg / 2.16 g/cm^3 = 0.139 mm^3. The volume of one unit cell of NaCl is 0.052 nm^3. Dividing the volume of the grain of salt by the volume of one unit cell gives approximately 2680 unit cells.
No, animal cells do not contain starch grains. Starch is primarily found in plant cells as a storage molecule for energy. Animal cells store energy in the form of glycogen, not starch.
A typical human body contains approximately 37.2 trillion cells. These cells make up tissues, organs, and organ systems, allowing the body to function properly.
Many things such as... a nucleus and specialized organelles.
one
Within a single pollen grain there are 2 sperm cells
One.
Twelve volt batteries contain a series of 6 cells in the series.
Nuclei do not contain cells, cells contain nuclei (normally, one nucleus per cell).
ture or palse plant cells contain many small vacuoles? yes by rosi
cells don't contain other cells
7.5
1
No, animal cells do not contain starch grains. Starch is primarily found in plant cells as a storage molecule for energy. Animal cells store energy in the form of glycogen, not starch.
They can contain up to 50 000 cells. (Wikipedia)
They can contain up to 50 000 cells. (Wikipedia)
100 trillion
A typical solar panel consists of multiple solar cells, with the number varying depending on the size and wattage of the panel. Standard residential solar panels contain 60, 72, or 96 solar cells.