![]() Visualize trends, 3D orbitals, isotopes, and mix compounds. Interactive periodic table showing names, electrons, and oxidation states. Na 23.0 g mol-1 Cl 35.5 g mol-1 Step 3: Add the component parts up and it will give you the molar mass of the compound (NaCl). If you look straight into the periodic table, you can identify it immediately. According to the definition of the mole, 12 g of 12C contains 1 mole of 12C atoms (its molar mass is 12 g/mol). For elements with no stable isotopes, the mass number of the isotope with the longest half-life is in parentheses. You need to find the molar mass of Na and Cl. Per the amu definition, a single 12C atom weighs 12 amu (its atomic mass is 12 amu). The calculated value makes sense because it is almost four times times the mass for 1 mole of aluminum. (credit: modification of work by Mark Ott).īecause the definitions of both the mole and the atomic mass unit are based on the same reference substance, 12C, the molar mass of any substance is numerically equivalent to its atomic or formula weight in amu. Prepare a concept map and use the proper conversion factor. The given number of moles is a very small fraction of a mole (10 4 or one-ten thousandth). The molar mass for this compound is computed to be 176.124 g/mol. 1: Moles to Mass Conversion with Elements. ![]() According to the periodic table, 1 mol of U has a mass of 238.0 g, so the mass of 2 mol is twice that, or 476.0 g. From left to right (bottom row): 32.1 g sulfur, 28.1 g silicon, 207 g lead, and 118.7 g tin. 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 periodic table shows that the atomic mass (rounded to two decimal points) of Al is 26.98, so 1 mol of Al atoms has a mass of 26.98 g. From left to right (top row): 65.4 g zinc, 12.0 g carbon, 24.3 g magnesium, and 63.5 g copper. ![]() This molar mass calculator can only handle two bracket levels at a time.\) atoms -1.00 mol of atoms. Tricalcium phosphate would be entered as Ca3(PO4)2. For example, calcium carbonate would be entered as CaCO3, not caco3. The periodic table lists the atomic mass of carbon as 12. For example, if we are trying calculate for ammonia (NH 3 ), then we. The atomic mass is equal to the atomic number which is listed below the element symbol. The chemical formula should be entered using standard format. The molar mass of any substance is its atomic mass, molecular mass, or formula mass in grams per mole. Molar Mass of Ammonia NH 3 Step 1: The first step for calculating molar mass is to identify all the elements in a given molecule and write their atomic masses using the periodic table. This calculator is a convenient tool for calculating the molar mass of chemical compounds in lieu of using a periodic table. 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. 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 For example, certain types of chlorine dioxide (ClO2) generators would use sodium hypochlorite (NaOCl), sodium chlorite (NaClO2) and hydrochloric acid (HCl). When calculating consumption of certain RO chemicals for reverse osmosis pretreatment or post-treatment, it is often necessary to convert into moles.
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