How to figure out how many electrons a gram of something has?

[MikeMike]

ok, so i have X.XX grams of gold, how do i figure out how many electrons are in it? does it have to deal with moles, and conversions?

i forget, some help would be nice.

 

[SLCentral]

Hey we just learned this in Chem on Friday . Damn shame I already forgot how to do it.

 

[darkxshade]

the answer is always eleventy billion, for an ATOTer, you should know better. :|

 

[dighn]

use molar mass to get number of atoms, times atomic number to get electronics

 

[Leper Messiah]

isn't one mole or something like that, which is 10^26 or something like that. Its been like 3 years since I had chem.

 

[Eli]

A Whole Fscking Shitload

 

[Heisenberg]

Originally posted by: dighn
use molar mass to get number of atoms, times atomic number to get electronics

Essentially, yes. Although using the atomic number only works if you're talking about the neutral atom. If it's an ion then you just use however many electrons each atom has.

 

[DrPizza]

Avogadro's number: 6.023*10^23

 

[Lonyo]

Originally posted by: DrPizza
Avogadro's number: 6.023*10^23

Yup, plus atomic/ionic and mass numbers.

 

[mwmorph]

molar mass( a mole) is just 10^26 atoms' gram weight.
10^26/ molar mass(atomic mass)*electron#

 

[JujuFish]

Originally posted by: DrPizza
Avogadro's number: 6.023*10^23

6.022*10^23

 

[sao123]

Wouldnt this be a good place for fermi estimation?

 

[orakle]

Follow my logic here. Gold (Au) has the atomic number 79 and weighs 196.97 g/mol. Since gold has 79 protons per atom (we know this from the atomic number), it also has 79 electrons per atom (balance of charge). Thus, if one gram of gold is 0.00508 mol (1/196.97), and a mole of gold has 79 * 6.02 * 10^23 electrons, one gram of gold has 0.00508 * 79 * 6.02 * 10^23 electrons, or 2.42 * 10^23 electrons per gram.

 

[MikeMike]

so with 1.86 grams of Gold, i would multiply 1.86 * (6.022*10^23) * 79 to find number of electrons, and then multiply by 1.60217*10^-19) to find charge?

 

[Platypus]

The answer is DRINK MORE JAGER.

 

[orakle]

Originally posted by: MIKEMIKE
so with 1.86 grams of Gold, i would multiply 1.86 * (6.022*10^23) * 79 to find number of electrons, and then multiply by 1.60217*10^-19) to find charge?

Wait, no.

6.022 * 10^23 * 79 is the number of electrons in a mole.

one mole of gold weighs 196.97 grams

you have 1.86 gram of gold, or 1.86/196.97 i.e. 0.00944 mole of gold.

so your #electrons is 0.00944 * 6.022 * 10^23 * 79 = 4.49 * 10^23

Not sure about that charge business though.

 

[MikeMike]

Originally posted by: CorporateRecreation
The answer is DRINK MORE JAGER.

shush!

 

[Fenixgoon]

X.X grams of gold divided by grams per mole times # avogadro's # atoms / mole times X electrons per atom