How many electrons are in 1.01 oz of a pure gold?

Question

This is a question I have on my Chem 1 homework and don't know how to solve it

Answer 1

Pretty much everything in chemistry comes down to working with MOLES.  So, figure out how many moles of gold you have, and then remember Avogadro's number of 6.02x10²³ atoms/mole.  Then you'll have your answer.

 

First, change 1.01 ounces of gold into grams of gold

• 1.01 ounces x 1 g/0.03527 ounces = 28.63 grams 

 

Now, convert grams to moles:

• 28.63 g x 1 mole/196.97 g = 0.145 moles gold

 

Finally, convert moles of gold to atoms of gold:

• 0.145 moles x 6.02x10²³ atoms/mole = 8.73x10²² atoms of gold

OOPS. I misread the question. You asked for # electrons. Each atom of gold has 79 electrons, so multiply that by the number of atoms, and you'll have # electrons.

Answer 2

Here is what you need to do:

 

1. Convert 1.01 ounces to grams

2. Look up the atomic weight and atomic number of gold in your chemistry book.  You will want the atomic weight in units of grams per mole.

3. Divide the number of grams of gold by the atomic weight of gold.  That gives you the number of moles of gold.

4. Multiply the number of moles of gold by Avogadro's number.  That gives you the number of atoms of gold.

5. Multiply the number of atoms of gold by the atomic number of gold.  That gives you the number of electrons.