Find the number of moles.
a. 3.01*10^23 molecules H2O.
b.1.000*10^23 atoms C.
c. 5.5610 *10^22 ions Na^+.
To find the number of moles in each case, we need to use Avogadro's number, which is 6.022 x 10^23 particles per mole.
a. To find the number of moles for 3.01 x 10^23 molecules of H2O, divide the given number of molecules by Avogadro's number:
Number of moles = (3.01 x 10^23 molecules H2O) / (6.022 x 10^23 molecules/mol)
≈ 0.5 moles
So, there are approximately 0.5 moles of water molecules.
b. To find the number of moles for 1.000 x 10^23 atoms of C, divide the given number of atoms by Avogadro's number:
Number of moles = (1.000 x 10^23 atoms C) / (6.022 x 10^23 atoms/mol)
≈ 0.166 moles
Thus, there are approximately 0.166 moles of carbon atoms.
c. To find the number of moles for 5.5610 x 10^22 ions of Na^+, divide the given number of ions by Avogadro's number:
Number of moles = (5.5610 x 10^22 ions Na^+) / (6.022 x 10^23 ions/mol)
≈ 0.092 moles
Therefore, there are approximately 0.092 moles of sodium ions.
There are 6.02 x 10^23 anythings in a mole. Substitute ions, molecules, atoms, loaves of bread, you name it, for anythings.
can you help me wih the first 2
No, but I'll do the first one for you.
You want moles. Notice that I multiply what you have at the beginning by a factor. The conversion factor converts molecules to moles. Guess what the factor is? The factor is (1 mol/6.02 x 10^23 anythings).
3.01 x 10^23 molecules H2O x (1 mole/6.02 x 10^23 molecules H2O)= 0.500 mole H2O.
Notice how the unit molecules H2O in the numerator cancels with the unit molecules H2O in the denominator (which gets rid of the unit we don't want) but the unit we want to keep (the one we want for the answer) is mole and that stays in the numerator.