What is the formula mass of NaCl (Atomic mass of Na = 22.9898 amu, Atomic mass of Cl = 35.4527 amu )? The units of formula mass “ atomic mass unit” (amu). The formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in the empirical formula. The key difference between formula mass and molar mass is that, the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula while molar mass is the mass in grams of 1 mol of substance.
It is the sum of the atomic mass values of individual components in the empirical formula (H 2O-18.00 g mol -1). Formula mass is calculated considering the empirical formula of a compound. Similarly, this leads to having various unique molar mass values for chemical compounds ( NaCl–58.4426 g mol -1). Different chemical elements have different molar mass values (C -12.01 g mol -1, Mg-24.3050 g mol -1) since they have a different number of positions in the nucleus. Therefore, the mass of 1mol (mass of 6.02 * 10 23 particles in grams) is used as the unit in quantitative analysis. Since atoms, molecules, and unit cells are extremely small particles the mass of one particle is negligibly small. Both of these parameters, the formula mass and molar mass, are related to the weight of chemical elements (atoms, molecules, unit cells). Key Difference – Formula Mass vs Molar Massįormula mass and molar mass are two physical properties of molecules that show some difference between them.
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