Chemistry moles?

Question

Fill in the blanks:

Element- H
Atomic Weight- 1
Mass of Element, g-
Amount, mol- 0.412
No. of atoms-

thanks!!!!!

Answer 1

moles = mass(grams) / Relative Molecular mass (Mr)
NB Hydrogen exists as a diatomic molecule (H2) so its Mr is 2.
mass = moles x Mr
mass = 0.412 x 2 = 0.824 grams
Using the Avogadro Number, 6.022 x 10^23, which is the number of molecules/atoms in 1 mole of a substance/element.
We have 0.412 moles
So number of molecules(H2) is
6.022 x10^23 x 0.412 = 2.48 x 10^23
The number of atoms(H) is
2.48 x 10^23 x 2 = 4.96 x 10^23.

Answer 2

Mass=1.008g/mol
no.of atoms=2/molecule

Answer 3

Im not sure of your question but if you are dealing with hydrogen and you need the atomic mass, look at a periodic table, its something like 1.042...something small like that.

As far as number of atoms...i know that the hydrogen atom is diatomic, as it is written sigularly as H2 ( thats when its not in a compound. )