[willylove]

Ok so I need someone to check my work think I got this wrong..

The thing we have to do:

Using average atomic masses for each of the following elements calculate the number of atoms present in each of the following samples.

320.7 amu of sulfur I got 6 atoms present

19,695 amu of xenon I got 9 atoms present

3588.3 amu of aluminum I got 8 atoms present

Is that correct or did I do something wrong??

[1stStrike]

Originally Posted by willylove

Ok so I need someone to check my work think I got this wrong..

The thing we have to do:

Using average atomic masses for each of the following elements calculate the number of atoms present in each of the following samples.

320.7 amu of sulfur I got 6 atoms present

19,695 amu of xenon I got 9 atoms present

3588.3 amu of aluminum I got 8 atoms present

Is that correct or did I do something wrong??

Your way way off. 6 atoms? You have to ask yourself if that's a reasonable answer

And your amu's are wrong as well, sulfer is 32.06 amu or 32.06 gm/mol

[sweetdreams]

atoms is in 6.022 10^23atoms
you need to convert to moles first then multiply it by 6.022 10^23

to convert to moles take the amu you are given and divide the value on the periodic table and multiply it by avogadro's number

[Qamar3212]

first convert your numbers you have to moles for example:

you have 320.7 amu's of sulfur, which is like 320.7 grams of sulfur. 1 mole of sulfur weights 32.066 grams.

So divide 320.7//32.066 to find how many moles of Sulfur YOU HAVE.

You get about 10 MOLES of sulfur.
Now 1 mole of any element contains avagadro's number which is 6.022 X 10^23 ATOMS

So just multiply the Amount of moles you have gotten which was 10 by avagadros number and you will get the number of atoms present .


Source:

Chemistry Major at Uconn