Question

What is mole concept? Calculate the number ofmolecules in 45g of water.

Answer 1

Mole can be defined as a unit which represents 6.023 x1023 particles of same matter is known as Mole Concept.

Mass of water = 45 g.Molecular mass of oxygen = 32g. Molecular mass of hydrogen = 2 g. So, Molecular mass of water = 32 + 2 = 34 g

Answer 2

Mole concept is the study to know the no of atoms molecules ions or particles in a given mass of a compound.
Molecular mass of water = 18 u
No of moles = 45 g / 18 u = 2.5
Thus the no of molecules = 2.5 * 6.022 * 10^23 molecules