Answer:
Explanation:
We are asked to convert particles to moles.
<h3>1. Avogadro's Number </h3>
1 mole of any substance contains the same number of particles (atoms, molecules, formula units). This is Avogadro's Number or 6.022*10²³.
In this problem, the particles are atoms of copper. So, 1 mole of copper contains 6.022*10²³ atoms of copper
<h3>2. Convert Atoms to Moles</h3>
Use Avogadro's Number to make a ratio.
We are trying to convert 8.3*10²⁰ atoms of copper to moles, so we multiply that value by the ratio.
The units of "atoms Cu" will cancel.
Condense the expression into 1 fraction.
<h3>3. Round</h3>
The original measurement of atoms has 2 significant figures, so our answer must have the same. For the number we calculated that is the ten-thousandths place.
The 7 in the hundredth thousandth place tells us to round the 3 up to a 4.
8.3*10²⁰ atoms of copper are equal to <u>0.0014 moles of copper. </u>