15. What is molar mass? How is it different from molecular mass? What is the
molar mass of H2O?
Answers
Answer:
In chemistry, the molar mass of a chemical compound is defined as the mass of a sample of that compound divided by the amount of substance in that sample, measured in moles. ... In the International System of Units (SI), the base unit of molar mass is kg/mol.
★QuestioN :
✳ What is molar mass? How is it different from molecular mass? What is the molar mass of H2O?
★ANswer :
☛ The molar mass is the mass of a given chemical element or chemical compound (g) divided by the amount of substance (mol). The molar mass of a compound can be calculated by adding the standard atomic masses (in g/mol) of the constituent atoms.
☛ Molecular weight is the mass of a molecule of a substance. It can also be called molecular mass. The units for molecular weight are atomic mass units (amu). Molar mass is the mass of one mole of a substance.
☛ 18.01528 g/mol
Mass of 1 mole of Hydrogen atoms= 1 g /mol
Mass of 1mole of Oxygen atoms = 16 g/mol
Mass of two moles of Hydrogen atoms = 2x 1 g/mol = 2 g/mol.
Mass of one mole of Oxygen atoms = 1 x 16 g /mol
On adding all the above-obtained values we get,
Mass of one mole of water = 2 g/mol + 16 g/mol = 18 g/mol