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To obtain one mole of copper atoms (6.02 x 1023 atoms), weigh out 63.55 g copper. The molar mass (M) of a substance is the mass of one mole of entities (atoms, molecules, or formula units) of the substance. Molar mass has units of grams per mole (g/mol).

The mass of 4.2 moles of copper, whose molar mass is 63.546 g/mol is equal to the 266.89 grams.

How do we calculate mass from moles?

Mass of any substance will be calculated by using their moles as:

n = W/M, where

W = required mass = ?

M = molar mass of copper = 63.546 g/mol

n = moles of copper = 4.2 mole

On putting values we get

W = (4.2)(63.546) = 266.89 g

Hence required mass of copper is 266.89 g.

To know more about mass & moles, visit the below link:

https://brainly.com/question/15373263

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