Question
Question: The molecular formula of glucose is \({{C}_{6}}{{H}_{12}}{{O}_{6}}\). Calculate its molecular mass. ...
The molecular formula of glucose is C6H12O6. Calculate its molecular mass. (Atomic mass: C = 12u, H = 1u, O = 16u.)
Solution
Let us first see what is the atomic mass. The atomic weight or atomic mass of an element can be calculated by taking the weighted average of all the isotopes of that element that exist in nature, considering their abundance.
Complete answer:
The mass of one mole of the substance is said to be the molar mass of that substance. It is usually expressed in g/mol but its SI base unit is kg/mol. It is not a molecular property of a substance but its bulk property.
A mole of any substance has exactly 6.022×1023 particles which can be ions, atoms, electrons, or molecules.
Now, the molecular mass of one mole of a compound can be calculated by taking the sum of atomic masses of all the elements present in the molecule.
It is given to us that the atomic masses of elements present in glucose are
C = 12 u
H = 1 u
O = 16 u
Since the molecular formula of glucose is C6H12O6, it has 6 atoms of carbon element, 12 atoms of hydrogen element, and 6 atoms of oxygen element
So, its molecular mass will be