Chem Question

[ManBearPig]

If 1.14 moles of a make beleive element weighs 354.98 g, then what would be the mass of a single atom in grams? Its atomic mass is 311.3852 amu.

thanks

 

[Tiamat]

google amu

also, here is wiki for mole:
http://en.wikipedia.org/wiki/Mole_(unit)

 

[Elderly Newt]

multiply Avogadro's Number by 1.14 (to find out the total amount of atoms in 1.14 moles) and then divide 354.98g by that number.

edit: or, yes, you could find out how many grams are in 1 amu and go from there.

 

[StevenYoo]

1.14 moles of stuff * (6.023 x 10^23 atoms/mole) = about 6.86 x 10^23 atoms

354.98grams / 6.86 x 10^23 atoms = 5.16 x 10^-22 g/atom

 

[sash1]

haha I remember doing that crap years ago

 

[chuckywang]

6.022 *10^23 atoms = 1 mole, which weighs 311.3852 grams. Should be very easy now.

 

[ManBearPig]

Originally posted by: Elderly Newt
multiply Avogadro's Number by 1.14 (to find out the total amount of atoms in 1.14 moles) and then divide 354.98g by that number.

edit: or, yes, you could find out how many grams are in 1 amu and go from there.

i tried that and got 1.8751x10 to the 26 and it didnt work 🙁

 

[chuckywang]

Originally posted by: Heen05

Originally posted by: Elderly Newt
multiply Avogadro's Number by 1.14 (to find out the total amount of atoms in 1.14 moles) and then divide 354.98g by that number.

edit: or, yes, you could find out how many grams are in 1 amu and go from there.

i tried that and got 1.8751x10 to the 26 and it didnt work 🙁

1 atom weighs 1.8751 *10^26 grams????? WOW, that's one HEAVY atom!!

 

[DrPizza]

Originally posted by: Heen05
If 1.14 moles of a make beleive element weighs 354.98 g, then what would be the mass of a single atom in grams? Its atomic mass is 311.3852 amu.

thanks

Rather than screwing around with Avogadro's number, why not simply convert from amu's to grams?? Especially since:
A) 3 significant digits in 1.14 moles
B) 5 significant digits in 354.98 grams
C) None of you posted Avogadro's number beyond 4 significant digits

D) 311.3854amu is 7 significant digits. Use that number in the calculation along with 1 amu = 1.66053886*10^-24 grams. That way, you have an answer with the most significant digits.

Also, here's a cool Google trick (Everyone click and learn)
try this (note what the search term is)