To calculate the weight of 3 x 10^23 atoms of copper (Cu), you need to determine the molar mass of copper and use Avogadro's number.
The molar mass of copper (Cu) is approximately 63.55 grams/mol. Avogadro's number, which represents the number of atoms in one mole of a substance, is approximately 6.022 x 10^23 atoms/mol.
Now, let's calculate the weight:
1 mole of Cu = 63.55 grams 1 mole of Cu = 6.022 x 10^23 atoms
Therefore, 1 atom of Cu = 63.55 grams / (6.022 x 10^23 atoms)
To find the weight of 3 x 10^23 atoms of Cu, multiply the weight of 1 atom by 3 x 10^23:
Weight = (63.55 grams / (6.022 x 10^23 atoms)) * (3 x 10^23 atoms)
Weight = 63.55 grams * (3 / 6.022)
Weight ≈ 31.67 grams
So, approximately 3 x 10^23 atoms of copper (Cu) weigh around 31.67 grams.