An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions. Ionic bonds are formed between a cation, which is usually a metal, and an anion, which is usually a nonmetal. A covalent bond involves a pair of electrons being shared between atoms.
Molar mass C2H6O = 46.06 g/mol
1 mole ------------- 46.06 g
?? moles ----------- 43.0 g
43.0 x 1 / 46.06 => 0.9335 moles
About 100 years ago. I hope that’s the answer you’re looking for :)