How many atoms are in a ring made of pure gold, Au (element 79), if there are 0.092 moles of gold in it?
i need help on what formula to use
Multiply the number of mols by Avagadro's number about 6.02 * 10^23
would it be 0.092 * 1/6.02 * 10^23?
Note that
0.092 mols x 6.02E23 atoms/mol = atoms which is the question. The mole unit cancels.
If you do 0.092 mols x (1 mole/6.02E23 atoms) = ? you get for units something like mols^2/atoms. You wanted atoms, not mols^2/atoms, right?
So which do you want to do?
To calculate the number of atoms in a given amount of substance, you can use Avogadro's number. Avogadro's number is the number of atoms or molecules in one mole of any substance, which is approximately 6.022 x 10^23.
The formula to calculate the number of atoms is:
Number of atoms = Number of moles x Avogadro's number
In this case, you have 0.092 moles of gold (Au), so you can use the formula to find the number of atoms.
Number of atoms = 0.092 moles x Avogadro's number
Now, substitute Avogadro's number into the equation:
Number of atoms = 0.092 moles x 6.022 x 10^23
Using a calculator, multiply 0.092 by 6.022 x 10^23 to get the final answer.