How many grams of lithium are in 1.25 x 10^26 atoms of Li?

Question

asked Jun 23, 2021 36.0k views

1 Answer

GgPeti · Answer 1 · 2021-06-29T18:50:02+0000

Mass of Lithium = 1443.73 g ≈ 1.4 kg

The mole is the number of particles(molecules, atoms, ions) contained in a substance

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

The number of atoms of Li = N=1.25 x 10²⁶

mol Li(n) :

$\tt n=(N)/(No)\\\\n=(1.25* 10^(26))/(6.02* 10^(23))\\\\n=2.08* 10^2$

mass Li (Ar=6.941 g/mol)

$\tt mass=mol* Ar\\\\mass=208* 6,941\\\\mass=1443.73~g$