Question

Will Give Medal For Correct Answers!

How Many Atoms Are In Gold, Lead, Uranium, And Sodium?

Answer 1

Gold, lead, uranium, and sodium are all ELEMENTS. It doesn't make sense to talk about how many atoms are in an element, because an element is a concept, not a quantity. You can ask how many atoms are in a SAMPLE of that element.

A better questions might be how many protons/neutrons/electrons are in a particular atom as these will vary across elements, isotopes, and ions.

Answer 2

thats kinda what i was getting at

Answer 3

Haha was this supposed to be a trick question...?

Answer 4

No but i do see your point, say 1 gram of each is the quantity

Answer 5

Well you would need to determine the molar mass of each element and use that to find how many moles are in that sample. Using that answer and Avogadro's number, you could calculate how many atoms are in the sample.

Answer 6

How so?

Answer 7

Take gold, for example. The molar mass is easy enough to find since it is the mass of the element, 197. The number of moles you have is therefore 1/197 = 5.08 x 10^-3.

To find atoms, multiply by Avogadro's number: 5.08 x 10^-3 * 6.02 x 10^23 = 3.06 x 10^21. This is how many atoms there are in 1 g of gold. Now do the same for the other elements.

Answer 8

what does the * suppose to mean?

Answer 9

Still multiplication. Just didn't want to confuse it with the "x" in the scientific notation.

Answer 10

oh ok, so the answer is an equation or do i multiply it?

Answer 11

The answer is 3.06 x 10^21 atoms. Hopefully you were able to follow my process above.

Answer 12

Yes somewhat. You shouldn't use a calculator can you?

Answer 13

Well I did...but normally in chemistry you're allowed to use a scientific calculator because the numbers are usually pretty hard to work with in your head.

Answer 14

really? I used a calculator and got a different answer?

Answer 15

I did a bit of rounding. Also when I say calculator, I mean copy/paste into google :P

I just redid the calculation and got the same answer.

Answer 16

ok got it. thanks, you were a huge help!

Answer 17

Np glad I could give you a hand!