can anyone help with this chemistry question? ?
A bottle of pure element was missing part of a label. The label said 2.258 x 1023 atoms. You determine the mass of the elements in the bottle to be 32.45386 g. What element is this?
- Roger the MoleLv 74 weeks agoFavorite Answer
(32.45386 g) / (2.258 x 10^23 atoms / (6.02214 x 10^23 atoms/mol)) = 86.555 g/mol
The element with an atomic mass like that is either Rb or Sr. (Since it is unlikely Rb would be kept in a bottle by itself (Because it reacts with air, it usually is kept under mineral oil.) I'd choose Sr.
- pisgahchemistLv 74 weeks ago
LOL .... bottles are not labeled by the number of atoms.
molar mass = grams / mol
molar mass = 32.45g / (2.258x10^23 atoms x (1 mol atoms / 6.022x10^23 atoms))
molar mass = 86.54 g/mol
There is no element with a molar mass of 86.54 g/mol.
Rubidium .... 85.47 g/mol
Strontium .... 87.62 g/mol