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**
Molecular Mass of CaCO3 (Calcium Carbonate)
Molecular mass of CaCO3 (calcium carbonate) = 100 g/mol. Step-by-step calculation using atomic masses of Ca, C, and O. Class 9–11 Chemistry.
Molecular Mass of CH4 (Methane)
Learn to calculate the molecular mass of CH4 (Methane). Understand the atomic masses of Carbon and Hydrogen to get 16 u.
Molecular Mass of Ethanol (C2H5OH)
Learn the step-by-step calculation for the molecular mass of Ethanol (Ethyl Alcohol). The exact molar mass is 46.07 g/mol.
Molecular Mass of HCl (Hydrochloric Acid)
Find the molecular mass of HCl. Learn how to add the atomic mass of Hydrogen (1 u) and Chlorine (35.5 u) to get 36.5 u.
Molecular Mass of Na₂SO₄ (Sodium Sulphate)
Learn how to calculate the molecular mass of Na₂SO₄ (Sodium Sulphate) step by step. The answer is 142 g/mol.
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