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
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