Respuesta :

Willchemistry
142 kg in grams:

1 kg ---------- 1000 g
142 kg -------- ?

142 x 1000 / 1 => 142000 g 

Atomic mass Cu =  63.54 a.m.u

Therefore:

63.54 g ------------ 6.02x10²³ atoms
142000 g --------- ??

142000 x ( 6.02x10²³) / 63.54 =

8.54.10²⁸ / 63.54 => 1.34.10²⁷ atoms of Cu

The correct option for the given question about Mole Concept is Na × 2230 atom of copper.

What is a mole?

  • A mole is a unit in chemistry.
  • A substance's mole is defined as its mass when it contains precisely 12 grams of the same number of atoms as 12C.
  • The mole is the SI unit used to calculate the amount of a Substance.
  • Its symbol is mol.

How to solve this question?

Number of moles of copper in pure copper statue

= ( mass of copper in statue / Molar mass of copper )

Number of moles of copper in pure copper statue = 142 Kg / 63.5 g

Number of moles of copper in pure copper statue = (142 × 1000)g /63.5 g

Number of moles of copper in pure copper statue = 2.23 × 1000 mol

Number of copper atoms in pure copper statue = Na × 2.23 ×1000 atoms

Number of copper atoms in pure copper statue = Na × 2230 atoms

Thus we can conclude that in 142 Kg of Copper, number of copper atom are Na × 2230 atoms, where Na is Avogadro Number.

Learn more about Mole Concept here:

brainly.com/question/16488605

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