How many atoms are there in a 5.2-g copper

There are copper atoms in 5.2 gram of metallic copper.

Step-by-step explanation:

Start by finding the number of moles of copper atoms in that 5.2 gram of metallic copper. Look up the relative atomic mass of copper on a modern periodic table.

In other words, the mass of one mole of copper atoms is 63.546 gram.

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How many moles of copper atoms in that 5.2 gram sample?

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Now, how many atoms is ?

The Avogadro's Number gives the number of particles in one mole:

. (Encyclopedia Britannica)

There are particles (a very large number) in one mole. of copper atoms will thus contain

copper atoms.