Question

The molecular formula of glucose is $C_6{H}_{12}{O}_6$. Calculate its molecular mass. (Atomic masses: C = 12 u; H = 1 u; O = 16 u)

Answer 1

Molecular mass : The sum of the atomic masses of all the atoms in a molecule of a substance is called the molecular mass of the molecule.

Generally we use relative atomic masses of atoms for calculating the molecular mass of 1 mole of any molecular or ionic substances.

Molecular formula of glucose is C₆H₁₂O₆

Atomic mass of H = 1

Atomic mass pf C = 12

Atomic mass of O = 16

Molecular mass of C₆H₁₂O₆ = 12(Atomic mass of Hydrogen) + 6(Atomic mass of carbon) + 6(Atomic mass of oxygen)

= 12 x 1 + 6 x 12 + 6 x 16

= 12 + 72 + 96 = 180 u.