1. Find the molar mass of copper:
* The molar mass of copper (Cu) is 63.546 g/mol. This means one mole of copper atoms weighs 63.546 grams.
2. Use Avogadro's number:
* Avogadro's number states that there are 6.022 x 10^23 atoms in one mole of any element.
3. Set up a proportion:
* We want to find the mass of 19 copper atoms. Let 'x' represent that mass.
(19 atoms / x grams) = (6.022 x 10^23 atoms / 63.546 grams)
4. Solve for x:
* Cross-multiply and solve for x:
x grams = (19 atoms * 63.546 grams) / (6.022 x 10^23 atoms)
* Calculate:
x ≈ 2.00 x 10^-21 grams
Therefore, the mass of 19 copper atoms is approximately 2.00 x 10^-21 grams.
