![]() ![]() 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. Let us calculate the molecular weight of some common compounds. The Problem: Chris the Chemist has just finished a detailed analysis of a molecule and has found that it is made up of two elements, phosphorus and oxygen. For example, in one mole of a chemical compound there are 6.022 x 1023 molecules. One mole of 'something' contains 6.022 x 1023 entities. A mole is the unit that measures the amount of a substance. In terms of a gram mass unit (molar mass): in a total of 142.04 g of sodium sulfate, 45.98 g are. 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. sodium, 32.06 parts are sulfur, and 64.00 parts are oxygen. We combine (react) many mers of ethylene together to form a polyethylene chain. So it's going to be six times 12.01 grams per mole plus 12 times 1.008 grams per mole plus every molecule of glucose has six oxygen plus six times 16.00 grams. ![]() For hydrogen, the atomic weight is 1.00794, and for oxygen it is 15.9994. 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. We then take the atomic weight of the atoms from the periodic table. It has a total of 6 atoms: 2 carbon (C) atoms and 4 hydrogen (H) atoms. The chemical formula for an ethylene monomer is -(CH2-CH2).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. Explanation: The molar mass of a chemical substance is the mass of one mole, or 6.023 × 10 particles. 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. Step 1: Molar mass of oxygen (O 2): The molar mass of oxygen 16 × 2 32 gmol-1. If the compound contains oxygen as well as carbon and hydrogen, calculate the mass of the oxygen by subtracting the mass of carbon and hydrogen from the total. Answer The molar mass of oxygen gas is 32 g/mol. How is mol calculated First you must calculate the number of moles in this solution, by rearranging the equation. The chemical formula for water is H2O, which means this molecule has 3 atoms: 2 of hydrogen (H) and 1 oxygen (O) atom. One mole of oxygen gas, which has the formula O 2, has a mass of 32 g and contains 6.02 X 1023 molecules of oxygen but 12.04 X 10 23 (2 X 6.02 X 10 23) atoms, because each molecule of oxygen contains two oxygen atoms.
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