Question

How many copper atoms are in a pure copper statue with a mass of 198 kg?

Answer 1

So in the periodic table, the atomic mass of one copper is 64.546.

One mole is 6.022x10^23 atoms.

You can use both of these to find the number of atoms.

The formula to find the amount of moles of something is "moles = grams / atomic mass"

103 kg --> 103,000 g.

103,000 divided by 63.546 = around 1620.873 moles.

All you need to do is multiply 1620.873 to 6.022x10^23 and you get the number of atoms in copper!

Answer 2

No.of copper atoms= no.of moles x No x atomicity

(No - avagardro's number )

= wt / atomic mass x No x 1

= 198 x 10 ^3 g / 63.5 x No

= 3.118 x 10^3 x 6.02 x 10^23

= 18.77 x 10^26 atoms.