![]() ![]() The molecular mass of a substance is the actual mass of a molecule of a particular substance. Summary – Formula Unit Mass vs Molecular Massįormula unit mass is the mass of the empirical formula of a particular substance. The value of molecular mass is always larger or similar to the formula unit mass of the same substance. The value of formula unit mass is always smaller or similar to the molecular mass of the same substance. Molecular mass is the mass of a molecule in a particular substance. Hence, it is equivalent to the empirical formula of a complex compound.įormula unit mass or formula mass is the mass of the empirical formula of a particular substance. A repeating unit represents the monomer or monomers used to produce the polymer compound. A polymer is a macromolecule that is made out of many numbers of small compounds known as monomers. (Atomic mass of C) + 2(atomic mass of H) + (atomic mass of O) = (12 + + 16) amu = 30 amu.įor polymer compounds, formula unit mass is the mass of a repeating unit. (Atomic mass of Na) + (atomic mass of Cl) = (23 + 35.5) amu = 58.5 amu Formula Unit Mass of Complex Compoundsįor complex compounds such as C 11H 22O 11 (sucrose), the empirical formula is CH 2 Then the formula unit mass is, ![]() Calculation of Formula Unit Mass Formula Unit Mass of Simple Compoundsįor simple compounds such as NaCl (sodium chloride), the empirical formula and the molecular formula are the same. Let us consider few examples to understand the concept. For example, the empirical formula for C 6H 12O 6 ( glucose) is CH 2O. The empirical formula is the chemical formula of a substance that gives the simplest ratio between chemical elements present in a substance. This means, it is the sum of the atomic masses of the chemical elements present in the empirical formula. Side by Side Comparison – Formula Unit Mass vs Molecular Mass in Tabular Formįormula unit mass or formula mass is the mass of the empirical formula of a particular substance. Similarities Between Formula Unit Mass and Molecular Massĥ. The key difference between formula unit mass and molecular mass is that the value of formula unit mass is always smaller or similar to the molecular mass of the same substance whereas the value of molecular mass is always larger or similar to the formula unit mass of the same substance. But for complex compounds, there is a large difference between two values. ![]() For simple molecules, formula mass and molecular mass are the same. ![]() Molar mass is the mass of a mole of the substance whereas molecular mass is not the mass of a mole of a substance. Most of the time, the terms molar mass and molecular mass are used interchangeably, though they are distinct terms. The molecular mass of a compound is the mass of a molecule of a particular substance. When the mass of this formula is measured, it is known as formula unit mass. It does not give the actual number of each chemical element. In other words, it is the least ratio between chemical elements in a compound. The empirical formula of a compound is the chemical formula that gives the ratio between different atoms present in that compound in small, whole numbers. Key Difference – Formula Unit Mass vs Molecular Massįormula unit mass or formula mass of a compound is the mass of empirical formula of that compound. ![]()
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