Everything i know about Chemistry is a complete lie. ?

Question

Compute the mass in grams of a sample of amercium containing six atoms.

6 atoms Am x (243g/atom) = 1.46 x 10^3 g

my answer according to dimensional anaylsis should be correct!

i canceled out the atoms and grams is the only thing left over!

but my book has 2.42 x 10^-21

help? by the way this isnt a h.w. question. i actually like to learn. it sounds crazy but i do.

Answer 1

The number you see on the periodic table that we always call the atomic mass of the element is in reality the mass of an Avagadro's number of atoms or 1 mole of atoms. You surely cannot imagine that a single atom of Americium can have a mass of 243grams?

So we have 6.022*10^23 atoms will have a mass of 243.0grams. Now what is the mass of just 6 of these atoms?

Mass of 6 atoms: = (243.0/6.022*10^23)*6

Mass = 2.42*10^-21grams

Answer 2

lol those are some heavy atoms you got there

hint: moles, avogadro's number etc...

Answer 3

The unit of the AM molecular weight is wrong ( g/atom ). Its should be g/mol. Since the statement gives us a quantity in terms of atoms, we need to convert this atoms into moles. In conversion, we need the Avogadro's constant which is 6.022 x 10^23 atoms/mol.

6 atoms Am x ( 1 mole Am/ 6.022 x10^23 atoms Am )(243 g/mol)

THEREFORE: we have 2.42 x 10^-21 grams of AM sample.

Answer 4

SUCK my juicy dirtstar alex

*****

nerdy little 14 yr. old. born in 94 eh?

Bow down to old jabba

See? Even Trevor ponders your reasoning. 243 grams?