# Problem: How many atoms of copper are in an old penny made of pure copper and weighing 2.16 g? (Atomic mass of Cu = 63.55)

###### FREE Expert Solution

We’re asked to determine how many atoms of copper are in an old penny made of pure copper and weighing 2.16 g given the Atomic mass of Cu = 63.55

We can calculate the # of Cu atoms in a 2.16 g old penny using the following steps:

Step 1: Convert the mass to moles (using the  atomic mass or molar mass of Cu)

Step 2: Convert the number of moles to atoms (using the Avogadro’s number)

82% (344 ratings) ###### Problem Details

How many atoms of copper are in an old penny made of pure copper and weighing 2.16 g? (Atomic mass of Cu = 63.55)

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Mole Concept concept. You can view video lessons to learn Mole Concept. Or if you need more Mole Concept practice, you can also practice Mole Concept practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Marzal's class at UCF.