Frequently Asked Questions
What is the difference between molecular weight and molar mass?
Molecular weight (MW) is technically the mass of a single molecule in atomic mass units (amu or Da). Molar mass is the mass of one mole of molecules in grams per mole (g/mol). Numerically they are equal: water has MW = 18.015 amu and molar mass = 18.015 g/mol. In practice, chemists use the terms interchangeably.
How do I calculate the molar mass of a compound from its formula?
Identify each element and count its atoms, then multiply the count by the atomic mass from the periodic table. Sum all contributions. For H2SO4: (2 x 1.008) + (1 x 32.06) + (4 x 15.999) = 2.016 + 32.06 + 63.996 = 98.072 g/mol. The atomic mass of each element is on the periodic table, usually below the element symbol.
What is a dalton (Da) and how does it relate to g/mol?
A dalton (Da), also called an atomic mass unit (amu), is defined as 1/12 the mass of a carbon-12 atom = 1.66054 x 10^-24 g. Numerically, 1 g/mol = 1 Da per molecule when comparing mass scales. Biochemists commonly use kDa (kilodaltons) for protein masses - a protein with MW 50,000 Da = 50 kDa.
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