Determine the number of atoms in a copper strip that has a mass of 35.0 grams. A) 3.33 × 10²⁵ atoms B) 2.11 × 10²⁵ atoms C) 2.71 × 10²⁰ atoms D) 3.32 × 10²³ atoms E) 0.551 atoms

Question

Quizplus · Accepted Answer

To determine the number of atoms in the copper strip, we need to use the concept of Avogadro's number and molar mass. The molar mass of copper is 63.55 g/mol, which means that one mole of copper has a mass of 63.55 g and contains 6.022 × 10²³ atoms. 
The number of moles of copper in the given strip can be calculated as:
moles of copper = mass of copper strip / molar mass of copper
moles of copper = 35.0 g / 63.55 g/mol ≈ 0.552 mol
Therefore, the number of copper atoms in the strip can be calculated as:
number of copper atoms = moles of copper × Avogadro's number
number of copper atoms = 0.552 mol × 6.022 × 10²³ atoms/mol ≈ 3.32 × 10²³ atoms
Therefore, the correct answer is D.

Determine the Number of Atoms in a Copper Strip That