Question #b34ea

1 Answer
Jun 28, 2017

Answer:

Copper Atoms in 149 Kg pure Cu(s) = #1.41xx10^27# Cu atoms.

Explanation:

Given 149 Kg pure Copper => #1.49xx10^5# grams Copper (Cu(s)).
=> Convert grams Cu(s) to moles Cu(s) by dividing by its atomic mass. Then multiply by Avogadro's Number.

moles Cu(s) = #(1.49xx10^5 g Cu(s))/"63.546 (g/mole Cu(s))"# = 2,345 moles Cu(s)

atoms Cu = #2,345 "moles" Cu(s)((6.02xx10^23 "atoms" Cu)/("mole" Cu(s)))# = #1.41xx10^27 Cu- "Atoms"#