Calculate the molecularmass of menthol, C10H20O.
The Correct Answer and Explanation is :
Molecular Mass of Menthol (C₁₀H₂₀O)
To determine the molecular mass (molar mass) of menthol, we sum the atomic masses of all the atoms in its molecular formula C₁₀H₂₀O:
- Carbon (C): 10 atoms × 12.01 g/mol = 120.10 g/mol
- Hydrogen (H): 20 atoms × 1.008 g/mol = 20.16 g/mol
- Oxygen (O): 1 atom × 16.00 g/mol = 16.00 g/mol
Total molecular mass:
120.10 + 20.16 + 16.00 = 156.26 g/mol
Thus, the molecular mass of menthol is 156.26 g/mol.
Explanation (300 Words)
Menthol is a naturally occurring organic compound widely known for its cooling sensation and minty aroma. It belongs to the class of compounds called monoterpenoids and is commonly derived from peppermint oil. It is used in medicinal, cosmetic, and food products due to its soothing properties.
To determine the molecular mass of menthol, we need to use the atomic masses of its constituent elements. Each element has a specific atomic weight, typically measured in atomic mass units (amu) or grams per mole (g/mol).
The molecular formula of menthol, C₁₀H₂₀O, indicates that it contains:
- 10 carbon (C) atoms: Each carbon atom has an atomic mass of 12.01 g/mol.
- 20 hydrogen (H) atoms: Each hydrogen atom has an atomic mass of 1.008 g/mol.
- 1 oxygen (O) atom: Oxygen has an atomic mass of 16.00 g/mol.
By summing up these contributions, we obtain the molecular mass of 156.26 g/mol, meaning that one mole of menthol weighs 156.26 grams.
Molecular mass is crucial in various scientific fields, including chemistry, pharmacology, and materials science. It helps in determining molar concentrations in chemical reactions, understanding the behavior of molecules, and formulating precise dosages in pharmaceuticals.
Menthol is known for its interaction with the TRPM8 receptors in the skin and mucous membranes, leading to its characteristic cooling effect. This makes it a key ingredient in throat lozenges, pain relief balms, and cooling gels.
In summary, the molecular mass of menthol is 156.26 g/mol, and understanding it is essential in both theoretical and practical chemistry applications.