Question

One 63 Cu atom has a mass of 1.045 x 10-22 g. Calculate the mass of 3.0 moles of 63Cu atoms

Answer 1

The mass of 3.0 moles of ⁶³Cu atoms is 188.8 g

Stoichiometry

From the question, we are to calculate the mass of 3.0 moles of ⁶³Cu atoms.

From the given information,

One ⁶³Cu atom has a mass of 1.045 × 10⁻²² g

First, we will determine the number of atoms present in 3.0 moles of ⁶³Cu atoms

Using the formula,

Number of atoms = Number of moles × Avogadro's constant

Number of ⁶³Cu atoms present = 3.0 × 6.022 × 10²³

Number of ⁶³Cu atoms present = 18.066 × 10²³ atoms

Now, we will determine the mass  of 18.066 × 10²³ ⁶³Cu atoms

If 1 ⁶³Cu atom has a mass of 1.045 × 10⁻²² g

Then,

18.066 × 10²³ ⁶³Cu atoms will have a mass of 18.066 × 10²³ × 1.045 × 10⁻²²

18.066 × 10²³ × 1.045 × 10⁻²² = 188.7897 g

≅ 188.8 g

Hence, the mass of 3.0 moles of ⁶³Cu atoms is 188.8 g

Learn more on Stoichiometry here: brainly.com/question/13654901