24.1 O2 molecules * 2 = 48.2 Oxygen atoms in 4 moles of O2 As a final bonus calculation, you can convert between moles and mass. On the periodic table, each element has an atomic mass written next to it; Hydrogen's atomic mass is 1.01. This number means two things. First, it tells you the mass of a single atom. For example, 24 grams of 12C atoms would be equal to two moles since 24 grams. To understand how molar mass and Avogadro's number act as conversion.
Chemistry | DIY Projects | Atoms and Atomic Structure
To convert grams into atoms, you have to convert them into molesfirst. Get the molar mass and multiply it by the number of moles toget the atoms.
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Avogadro's number is one of the most important constants used in chemistry. It is the number of particles in a single mole of a material, based on the number of atoms in exactly 12 grams of the isotope carbon-12. Although this number is a constant, it's experimentally determined, so we use an approximate value of 6.022 x 1023. So, you know how many atoms are in a mole. Here's how to use the information to determine the mass of a single atom.
Avogadro's Number Example Problem: Mass of a Single Atom
Question: Calculate the mass in grams of a single carbon (C) atom.
Solution
To calculate the mass of a single atom, first look up the atomic mass of carbon from the periodic table.
This number, 12.01, is the mass in grams of one mole of carbon. One mole of carbon is 6.022 x 1023 atoms of carbon (Avogadro's number). This relation is then used to 'convert' a carbon atom to grams by the ratio:
This number, 12.01, is the mass in grams of one mole of carbon. One mole of carbon is 6.022 x 1023 atoms of carbon (Avogadro's number). This relation is then used to 'convert' a carbon atom to grams by the ratio:
mass of 1 atom / 1 atom = mass of a mole of atoms / 6.022 x 1023 atoms
Plug in the atomic mass of carbon to solve for the mass of 1 atom:
mass of 1 atom = mass of a mole of atoms / 6.022 x 1023
mass of 1 C atom = 12.01 g / 6.022 x 1023 C atoms
mass of 1 C atom = 1.994 x 10-23 g
mass of 1 C atom = 1.994 x 10-23 g
Answer
The mass of a single carbon atom is 1.994 x 10-23 g.
Applying the Formula to Solve for Other Atoms and Molecules
Although the problem was worked using carbon (the element upon which Avogadro's number is based), you can use the same method to solve for the mass of an atom or molecule. If you're finding the mass of an atom of a different element, just use that element's atomic mass.
If you want to use the relation to solve for the mass of a single molecule, there's an extra step. You need to add up the masses of all of the atoms in that one molecule and use them instead.
Let's say, for example, you want to know the mass of a single atom of water. From the formula (H2O), you know there are two hydrogen atoms and one oxygen atom. You use the periodic table to look up the mass of each atom (H is 1.01 and O is 16.00). Forming a water molecule gives you a mass of:
1.01 + 1.01 + 16.00 = 18.02 grams per mole of water
and you solve with:
mass of 1 molecule = mass of one mole of molecules / 6.022 x 1023
mass of 1 water molecule = 18.02 grams per mole / 6.022 x 1023 molecules per mole
mass of 1 water molecule = 2.992 x 10-23 grams