How many atoms of Cu are in 385 grams?

Understanding the Calculation:

To determine the number of atoms of Cu in 385 grams of copper, we first need to calculate the number of moles present in the given mass.

In order to do so, we utilize the molar mass of copper (Cu), which is approximately 63.55 g/mol. This means that 1 mole of copper atoms has a mass of 63.55 grams. Therefore, we can calculate the number of moles of copper in 385 grams as follows:

Number of Moles = Given Mass / Molar Mass

Number of Moles = 385 grams / 63.55 g/mol ≈ 6 moles

Calculating the Number of Atoms:

Once we have determined the number of moles of copper in 385 grams, we can then calculate the number of copper atoms present in this quantity.

Since 1 mole of any substance contains Avogadro's number of particles (6.022 x 10^23), we can use this information to find the number of copper atoms in 6 moles:

Number of Copper Atoms = Number of Moles × Avogadro's Number

Number of Copper Atoms = 6 moles × 6.022 x 10^23 ≈ 3.6132 x 10^24 atoms

Therefore, there are approximately 3.6132 x 10^24 atoms of Cu in 385 grams of copper.