In Chemistry, Molecular Mass (or Molar Mass) is the sum of the atomic masses of all atoms in one molecule. Simple compounds like water (18 g/mol) or salt (58.5 g/mol) have small values. But certain biological molecules have staggeringly large molecular masses.
Titin, a muscle protein, is the largest known protein molecule and has a molecular mass of approximately 3,000,000 g/mol (3 megadaltons)!
Proteins and DNA are polymers — giant chain molecules made by linking thousands or millions of smaller units (monomers) together.
Each link in the chain adds to the total molecular mass, which is why these biological molecules dwarf simple compounds.
For a typical MCQ in Class 11 Chemistry asking 'which has the greatest molecular mass' among simple compounds:
Formula: Molecular Mass = sum of (atomic mass × number of atoms) for each element.
CO₂ = C + 2O = 12 + (2×16) = 12 + 32 = **44 g/mol**
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