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Hint: Count the number of atoms of each element, and then multiply that number by the element's atomic weight. Use the table below to find the atomic weight of each atom (element), or refer to a Periodic Table of the Elements. What Is Molar Mass Molar mass is the mass (in atomic mass units) of one mole of a of a substance. Let us calculate the molecular weight of some common compounds. For example, in one mole of a chemical compound there are 6.022 x 1023 molecules. The molar mass and molecular weight of H 20 is 20.159. Definitions Molecular mass ( molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). One mole of 'something' contains 6.022 x 1023 entities. A mole is the unit that measures the amount of a substance. The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. One thousand mers connected together would add up to a weight of 28,000 grams/mole and would have 6,000 atoms.Ī mole is the standard method in chemistry for communicating how much of a substance is present. 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. We combine (react) many mers of ethylene together to form a polyethylene chain. The atomic weight of carbon is 12 and that of hydrogen is 1, so one mer of ethylene has a weight of 2(12) + 4(1) = 28. It has a total of 6 atoms: 2 carbon (C) atoms and 4 hydrogen (H) atoms.
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The chemical formula for an ethylene monomer is -(CH2-CH2).
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In order to calculate the molecular weight of one water molecule, we add the contributions from each atom that is, 2(1) + 1(16) = 18 grams/mole. Using the periodic table of the elements to find atomic weights, we find that hydrogen has an atomic weight of 1, and oxygen's is 16. Multiply the number of atoms by the atomic weight of each element found in steps 1 and 2 to get the mass of each element in H2SO4: Molar Mass (g/mol) H (Hydrogen) 2 × 1.00794 2.01588. The chemical formula for water is H2O, which means this molecule has 3 atoms: 2 of hydrogen (H) and 1 oxygen (O) atom.