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If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. Element Fluorine (F), Group 17, Atomic Number 9, p-block, Mass 18.998. Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance. Tricalcium phosphate would be entered as Ca3(PO4)2. This site explains how to find molar mass. For example, calcium carbonate would be entered as CaCO3, not caco3. The chemical formula should be entered using standard format. This calculator is a convenient tool for calculating the molar mass of chemical compounds in lieu of using a periodic table. atom + Molar mass of 1 Fluorine (F) atom. Because the molar mass of any molecule (or compound) can be calculated by simply adding the molar masses of individual atoms. These include consumption of pH adjustment chemicals for RO feedwater, solubilities of scale forming compounds in reverse osmosis systems, and cation rejection calculations using charge balance (meq/l) in nanofiltration systems. If you have a periodic table with you, then you can easily calculate the molar mass of NaF (Sodium fluoride). Many other calculations require conversion into moles. Knowing the desired concentration of ClO2, the system integrator can calculate the consumption of each of the reactants using the stoichiometric relationship:ĢNaClO2 + NaOCl + 2HCl ↔ 2ClO2 + H2O + 3NaCl The given mass of K (4.7 g) is a bit more than one-tenth the molar mass (39.10 g), so a reasonable ballpark estimate of the number of moles would be slightly greater than 0.1 mol. Find the molar mass of Fe (55.85 g/mol) and O (16.00 g/mol). In our case, our two elements are iron and oxygen. The molar mass of atoms of an element is given by the relative atomic mass of the element multiplied by the molar mass constant, Mu 1 × 103 kgmol1. For example, certain types of chlorine dioxide (ClO2) generators would use sodium hypochlorite (NaOCl), sodium chlorite (NaClO2) and hydrochloric acid (HCl). Referring to the periodic table, the atomic mass of K is 39.10 amu, and so its molar mass is 39.10 g/mol. The molar mass of Fe2O3 is 159.70 g/(mol) To find the molar mass of a compound you would use the periodic table to find the molar mass of each element separately. When calculating consumption of certain RO chemicals for reverse osmosis pretreatment or post-treatment, it is often necessary to convert into moles.