Example: calculating molar mass. Let's calculate the molar mass of carbon dioxide (CO 2): Carbon (C) has an atomic mass of about 12.01 amu. Oxygen (O) has an atomic mass of about 16.00 amu. CO 2 has one carbon atom and two oxygen atoms. The molar mass of carbon dioxide is 12.01 + (2 × 16.00) = 44.01 g/mol. Lesson on computing molar massMolar Mass of a Molecule. Apply the same principles to calculate the molar mass of a molecule. The molar mass of water is the mass of one mole of H 2 O. Add together the atomic masses of all of the atoms of hydrogen and water in a molecule of water : 2 x 1.008 g (hydrogen) + 1 x 16.00 g (oxygen) = 18.02 g. For more practice, download …Jan 27, 2021 ... What is the molar mass of oxygen? 37 views · 3 years ago ...more ... Molar Mass / Molecular Weight of O2 (Oxygen Gas). Wayne Breslyn•162K ...Example: calculating molar mass. Let's calculate the molar mass of carbon dioxide (CO 2): Carbon (C) has an atomic mass of about 12.01 amu. Oxygen (O) has an atomic mass of about 16.00 amu. CO 2 has one carbon atom and two oxygen atoms. The molar mass of carbon dioxide is 12.01 + (2 × 16.00) = 44.01 g/mol. Lesson on computing molar massThe molar mass is defined as the mass of a given substance divided by the amount of a substance, is expressed in grams per mol (g/mol). That makes the molar mass an average of many particles or molecules, and the molecular mass the mass of one specific particle or molecule. The molar mass is usually the more appropriate quantity when dealing ...A good way to decide if your weight is healthy for your height is to figure out your body mass index (BMI). You and your health care provider can use your BMI to estimate how much ...Example: calculating molar mass. Let's calculate the molar mass of carbon dioxide (CO 2): Carbon (C) has an atomic mass of about 12.01 amu. Oxygen (O) has an atomic mass of about 16.00 amu. CO 2 has one carbon atom and two oxygen atoms. The molar mass of carbon dioxide is 12.01 + (2 × 16.00) = 44.01 g/mol. Lesson on computing molar massLox Liquid Oxygen Oxygen Gas Triplet Oxygen Diatomic Oxygen Molecular Oxygen Oxygen O₂. O2 Molar Mass O2 Bond Polarity O2 Oxidation Number. Products. Hematite - Fe 2 O 3. Iron(3+);Oxygen(2-) Haematitis Of Pliny Raphisiderite Oligiste Blood Stone. Fe2O3 Molar Mass Fe2O3 Oxidation Number. Thermodynamics.Molar mass of O = 15.9994 g/mol. Convert grams oxygen to moles. or. moles oxygen to grams. Molar Mass: 31.9988. O2 Molar Mass Converter. Weight: Mole: Example Reactions: • 2 H2 + O2 = 2 H2O • Mg + O2 = MgO2 • HgO2 = Hg + O2 ... The molar mass of gold is 196.97 g/mol. To find this number, multiply the atomic mass by the molar mass constant, which is one gram per one mole because gold in its elemental form ...Jul 22, 2022 · For example, the atomic mass of an oxygen atom is 16.00 amu; that means the molar mass of an oxygen atom is 16.00 g/mol. Further, if you have 16.00 grams of oxygen atoms, you know from the definition of a mole that your sample contains 6.022 x 10 23 oxygen atoms. Calculate the molar mass of 6O2 in grams per mole or search for a chemical formula or substance. Molecular weight of 6O2. ... moles 6O2 to grams. Molecular weight calculation: 6 + 15.9994*2. Percent composition by element. Element: Oxygen Symbol: O Atomic Mass: 15.9994 # of Atoms: 2 Mass Percent: 100.000%. Calculate the molecular …Example: calculating molar mass. Let's calculate the molar mass of carbon dioxide (CO 2): Carbon (C) has an atomic mass of about 12.01 amu. Oxygen (O) has an atomic mass of about 16.00 amu. CO 2 has one carbon atom and two oxygen atoms. The molar mass of carbon dioxide is 12.01 + (2 × 16.00) = 44.01 g/mol. Lesson on computing molar mass O2 Molar Mass O2 Bond Polarity O2 Oxidation Number. Products. Water - H 2 O. Hydroxic Acid H₂O [Oh2] Aqua Pure Water Hydrogen Oxide Oxidane Dihydrogen Oxide. H2O Molar Mass H2O Oxidation Number. Thermodynamics. Thermodynamics of the reaction can be calculated using a lookup table. Choose Compound States. H2As you calculated in Example 1, the molecular mass of ethanol is 46.069 amu. Because 1 mol of ethanol contains 2 mol of carbon atoms (2 × 12.011 g), 6 mol of hydrogen atoms (6 × 1.0079 g), and 1 mol of oxygen atoms (1 × 15.9994 g), its molar mass is 46.069 g/mol.Example: calculating molar mass. Let's calculate the molar mass of carbon dioxide (CO 2): Carbon (C) has an atomic mass of about 12.01 amu. Oxygen (O) has an atomic mass of about 16.00 amu. CO 2 has one carbon atom and two oxygen atoms. The molar mass of carbon dioxide is 12.01 + (2 × 16.00) = 44.01 g/mol. Lesson on computing molar mass Step 4: Substitute Coefficients and Verify Result. Count the number of atoms of each element on each side of the equation and verify that all elements and electrons (if there are charges/ions) are balanced. CH4 + 2 O2 = CO2 + 2 H2O. Reactants. Products. Find the Molar Mass of 2 Mg + O 2 Step-by-Step. There are 4 easy steps to find the molar mass of 2Mg + O2 based on its chemical formula. 1. Count The Number of Each Atom. The first step to finding the molar mass is to count the number of each atom present in a single molecule using the chemical formula, 2Mg + O2:Sep 21, 2021 ... File:Periodic-table.jpg Finding the Molar Mass (sometimes called Molecular ... Predict the Products of the Reaction for H2 + O2 (Hydrogen Gas + ...Calculate the molar mass of Al2O3 in grams per mole or search for a chemical formula or substance. Molecular weight of Al2O3. ... Mass Percent: 52.925%. Element: Oxygen Symbol: O Atomic Mass: 15.9994 # of Atoms: 3 Mass Percent: 47.075%. Calculate the molecular weight of a chemical compound.Word Equation. Propane + Dioxygen = Carbon Dioxide + Water. C3H8 + O2 = CO2 + H2O is a Combustion reaction where one mole of Propane [C 3 H 8] and five moles of Dioxygen [O 2] react to form three moles of Carbon Dioxide [CO 2] and four moles of Water [H 2 O]Atomic Weights and Isotopic Compositions for Oxygen Isotope Relative Atomic Mass Isotopic Composition Standard Atomic Weight Notes : 8 : O : 16 : 15.994 914 619 57(17) 0.997 57(16) [15.999 03, 15.999 77] 17 : 16.999 131 756 50(69) 0.000 38(1) 18 : 17.999 159 612 86(76) 0.002 05(14) ...For example, the atomic mass of an oxygen atom is 16.00 amu; that means the molar mass of an oxygen atom is 16.00 g/mol. Further, if you have 16.00 grams of oxygen atoms, you know from the definition of a mole that your sample contains 6.022 x 10 23 oxygen atoms. The concept of molar mass can also be applied to compounds.The molar mass of molecular oxygen O2 is 32 g/mol. This means that 1 mole of oxygen, containing a number of molecules equal to Avogadro’s constant, weighs 32 grams. Oxygen is a col...May 12, 2014 ... Comments291 · Converting Between Grams and Moles · Converting Between Moles, Atoms, and Molecules · How To Calculate The Molar Mass of a Compo...Molar Mass, Molecular Weight and Elemental Composition Calculator 输入计算其摩尔质量和元素的组合物的化学式: 摩尔质量 of O 2 (氧) is 31.99880 ± 0.00060 g/mol Jul 22, 2022 · For example, the atomic mass of an oxygen atom is 16.00 amu; that means the molar mass of an oxygen atom is 16.00 g/mol. Further, if you have 16.00 grams of oxygen atoms, you know from the definition of a mole that your sample contains 6.022 x 10 23 oxygen atoms. Types of Teeth - There are different types of teeth and different ways of naming them. Learn about types of teeth, tooth surfaces and the Universal System of naming them. Advertise...Example: calculating molar mass. Let's calculate the molar mass of carbon dioxide (CO 2): Carbon (C) has an atomic mass of about 12.01 amu. Oxygen (O) has an atomic mass of about 16.00 amu. CO 2 has one carbon atom and two oxygen atoms. The molar mass of carbon dioxide is 12.01 + (2 × 16.00) = 44.01 g/mol. Lesson on computing molar massMar 10, 2021 ... To book a personalized 1-on-1 tutoring session: Janine The Tutor https://janinethetutor.com More proven OneClass Services you might be ...Jun 19, 2019 · The molar mass of an element is found on the periodic table, and it is the element's atomic weight in grams/mole (g/mol). If the mass of a substance is known, the number of moles in the substance can be calculated. Converting the mass, in grams, of a substance to moles requires a conversion factor of (one mole of substance/molar mass of ... Molecular oxygen (O2) consists of two oxygen atoms Therefore, the molar mass of O2 = 2 * molar mass of oxygen atom = 2 * 15.9994 g/mol = 31.9988 g/mol For …Molecular oxygen (O2) consists of two oxygen atoms Therefore, the molar mass of O2 = 2 * molar mass of oxygen atom = 2 * 15.9994 g/mol = 31.9988 g/mol For …Dec 14, 2010 ... To see all my Chemistry videos, check out http://socratic.org/chemistry How to set up and solve ideal gas law problems that involve molar ...The molar mass and molecular weight of O2{+} is 31.998. Instructions. This program determines the molecular mass of a substance. Enter the molecular formula of the substance.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 CH4: Molar Mass (g/mol) C (Carbon) 1 × 12.0107 = 12.0107. H (Hydrogen) 4 × 1.00794 = 4.03176. 4. Sum Each Element's Mass. Finally, add together the total mass of each element to get the molar mass of CH4: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 P2O5: Molar Mass (g/mol) P (Phosphorus) 2 × 30.973762 = 61.947524. O (Oxygen) 5 × 15.9994 = 79.997. 4. Sum Each Element's Mass. Finally, add together the total mass of each element to get the molar mass of P2O5:One mole of O2 gas has a mass of 32.00 grams. This is calculated by adding the atomic masses of the two oxygen atoms in one molecule of O2 (16.00 g/mol ...Multiply the relative atomic mass by the molar mass constant. This is defined as 0.001 kilogram per mole, or 1 gram per mole. This converts atomic units to grams per mole, making the molar mass of hydrogen 1.007 grams per mole, of carbon 12.0107 grams per mole, of oxygen 15.9994 grams per mole, and of chlorine 35.453 grams per mole. …Molecular oxygen. Molecular Formula O. Average mass 31.999 Da. Monoisotopic mass 31.989828 Da. ChemSpider ID 952.Jan 27, 2021 ... What is the molar mass of oxygen? 37 views · 3 years ago ...more ... Molar Mass / Molecular Weight of O2 (Oxygen Gas). Wayne Breslyn•162K ...Jun 19, 2019 · The molar mass of an element is found on the periodic table, and it is the element's atomic weight in grams/mole (g/mol). If the mass of a substance is known, the number of moles in the substance can be calculated. Converting the mass, in grams, of a substance to moles requires a conversion factor of (one mole of substance/molar mass of ... 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 NH3: Molar Mass (g/mol) N (Nitrogen) 1 × 14.0067 = 14.0067. H (Hydrogen) 3 × 1.00794 = 3.02382. 4. Sum Each Element's Mass. Finally, add together the total mass of each element to get the molar mass of NH3:Molar Mass, Molecular Weight and Elemental Composition Calculator 몰 질량 및 원소 구성을 계산하고자 하는 화학식을 입력하십시오.: 몰 질량 of O 2 (산소) is 31.99880 ± 0.00060 g/molTwo water molecules contain 4 hydrogen atoms and 2 oxygen atoms. A mole of water molecules contains 2 moles of hydrogen atoms and 1 mole of oxygen atoms. Example \(\PageIndex{2}\) ... The molar mass of any compound is the mass in grams of one mole of that compound. One mole of carbon dioxide molecules has a mass of …Atomic mass of all elements (along with the rounded off values) is mentioned in the chart below. Atomic Number Element Atomic Mass (u) ... Atomic mass of Oxygen (O) 15.999: 16: 9: Atomic mass of Fluorine (F) 18.998: 19: 10: Atomic mass of Neon (Ne) 20.180: 20: 11: Atomic mass of Sodium (Na) 22.990: 23: 12: Atomic mass of …O2 is a colorless, odorless, and tasteless gas. Density of oxygen is 1.429 g/L. The boiling point is -183.0 C. Melting point −218.4 °C. The O2 molar mass is 15.9994 g/mol. Oxygen has two allotropic forms, O2 and O3. O2 molecule is nonpolar in nature.The molar mass is defined as the mass of a given substance divided by the amount of a substance, is expressed in grams per mol (g/mol). That makes the molar mass an average of many particles or molecules, and the molecular mass the mass of one specific particle or molecule. The molar mass is usually the more appropriate quantity when dealing ...Molar Mass, Molecular Weight and Elemental Composition Calculator. Digite uma fórmula química para calcular a sua massa molar e composição de elementos: Massa molar of O2 (Oxigênio) is 31.99880 ± 0.00060 g/mol. Ei! In chemistry, the molar mass ( M) of a chemical compound is defined as the ratio between the mass and the amount of substance (measured in moles) of any sample of said compound. [1] The molar mass is a bulk, not molecular, property of a substance. The molar mass is an average of many instances of the compound, which often vary in mass due to ... Molecular mass = the sum of the atomic masses of each atom in the molecule. Therefore, the molecular mass of water, H 2 O, is equal to the sum of the atomic masses of two hydrogen atoms and one oxygen atom, which can be found on the periodic table. Molecular mass H 2 O. = 2 (1.00794) + 15.9994 = 18.0153. Notice that the atomic mass …The molar mass of molecular oxygen O2 is 32 g/mol. This means that 1 mole of oxygen, containing a number of molecules equal to Avogadro’s constant, weighs 32 grams. Oxygen is a col...Oxygen (O - Standard atomic weight), molar mass. Oxygen is a chemical element with symbol O and atomic number 8. Oxygen was discovered by Carl Wilhelm Scheele, in Uppsala, in 1773. Type the number of Oxygen (O) you want to convert in the text box, to see the results in the table. 1 O. Mass hysteria epidemics are not as rare as you might think. Learn some super strange mass hysteria at HowStuffWorks. Advertisement For two weeks in 1956, people who lived near Taip...Apr 28, 2021 ... Mass = Mole xx Molar mass =2 mole xx32 g mol^(-1) =64g.The relative atomic mass of an element close element A substance made of one type of atom only., symbol A r, ... (A r = 12) and two oxygen atoms (A r = 16): M r of CO 2 = 12 + 16 + 16 = 44.The molar mass of gold is 196.97 g/mol. To find this number, multiply the atomic mass by the molar mass constant, which is one gram per one mole because gold in its elemental form ...Explanation of how to find the molar mass of Fe2O3: Iron (III) oxide.A few things to consider when finding the molar mass for Fe2O3:- make sure you have the ...The molar mass is defined as the mass of a given substance divided by the amount of a substance, is expressed in grams per mol (g/mol). That makes the molar mass an average of many particles or molecules, and the molecular mass the mass of one specific particle or molecule. The molar mass is usually the more appropriate quantity when dealing ...You can see that in H2O, there are 2 Hydrogen atoms and 1 Oxygen atom. So, Molar mass of H2O = Molar mass of 2 Hydrogen (H) atoms + Molar mass of 1 Oxygen (O) atom. = (1.008) 2 + 15.999. = 2.016 + 15.999. = 18.015 g/mol. Hence the Molar mass of H2O is 18.015 g/mol. I hope you have understood the short and simple …The induvidual gas constant, R, for a gas can be calculated from the universal gas constant, R u ( given in several units below ), and the gas molecular weight, M gas : R = R u /M gas [1] In the imperial system the most common units for the individual gas constant are ft lb/slug o R . In the SI system the most common units are J/kg K .It has a role as an anti-inflammatory drug, a reagent, a nutrient, a micronutrient, an oxidising agent, a human metabolite, a member of food packaging gas and a Saccharomyces cerevisiae metabolite. It is a conjugate base of a hydridodioxygen (1+). Oxygen is an element displayed by the symbol O, and atomic number 8. 3. Compute Mass of Each Element. 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 Na2SO4: Molar Mass (g/mol) Na (Sodium) 2 × 22.98976928 = 45.97953856. S (Sulphur/Sulfur) 1 × 32.065 = 32.065. O (Oxygen)BT and EE. O2 and 3. What messages are to be found in this strange alphanumeric soup? Hong Kong’s Hutchison Whampoa confirmed today that it will buy o2, the British mobile network ...The formula for the molecular weight of oxygen. The molecular weight of oxygen O 2 = 2 × the atomic mass of O. Step 3. The molecular weight of oxygen. Oxygen O 2 is a diatomic molecule. So, the molecular weight of oxygen is as follows:-. The molecular weight of oxygen O 2 = 2 × ( 16) u. = 32 u. Hence, the molecular weight of oxygen is 32 u.The molar amount of a substance may be calculated by dividing its mass (g) by its molar mass (g/mol): The factor-label method supports this mathematical approach since the unit “g” cancels and the answer has units of “mol:”. 4.7 g K ⎛⎝ mol K 39.10 g K ⎞⎠ = 0.12mol K 4.7 g K ( mol K 39.10 g K) = 0.12 mol K. Sep 21, 2021 ... File:Periodic-table.jpg Finding the Molar Mass (sometimes called Molecular ... Predict the Products of the Reaction for H2 + O2 (Hydrogen Gas + ...The molar mass of a substance is defined as the mass of 1 mol of that substance, expressed in grams per mole, and is equal to the mass of 6.022 × 10 23 …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 NH3: Molar Mass (g/mol) N (Nitrogen) 1 × 14.0067 = 14.0067. H (Hydrogen) 3 × 1.00794 = 3.02382. 4. Sum Each Element's Mass. Finally, add together the total mass of each element to get the molar mass of NH3:Finally, for oxygen, we multiply the molar mass of 15.9994 by 2. This equals 31.9988 grams per mol. Now, to finish, we must add all these masses together, which gives us a total of 60.05196 grams ...The molar mass and molecular weight of O2{-} is 31.999. To find the mole fraction and percentage of each element in O2{-}, divide each total from step 3 by the total molar mass found in step 4: The molar amount of a substance may be calculated by dividing its mass (g) by its molar mass (g/mol): The factor-label method supports this mathematical approach since the unit “g” cancels and the answer has units of “mol:”. 4.7 g K ⎛⎝ mol K 39.10 g K ⎞⎠ = 0.12mol K 4.7 g K ( mol K 39.10 g K) = 0.12 mol K.Carbon dioxide is a chemical compound with the chemical formula CO 2.It is made up of molecules that each have one carbon atom covalently double bonded to two oxygen atoms. It is found in the gas state at room temperature, and as the source of available carbon in the carbon cycle, atmospheric CO 2 is the primary carbon source for life on Earth. In the air, …Molar mass of O = 15.9994 g/mol. Convert grams oxygen to moles. or. moles oxygen to grams. We can use the rearranged molarity equation to calculate the moles of NaCl needed for the specified concentration and volume: mol NaCl = [ NaCl] × L of solution = 0.800 mol L × 0.250 L = 0.200 mol NaCl. We can then use the molecular weight of sodium chloride, 58.44 g mol , to convert from moles to grams of NaCl :The molar mass of molecular oxygen O2 is 32 g/mol. This means that 1 mole of oxygen, containing a number of molecules equal to Avogadro’s constant, weighs 32 grams. Oxygen is a col...Aug 20, 2020 ... . For our practice problem we'll convert grams of O2 (Oxygen gas) to moles and then to liters. First, we'll find the molar mass of O2. After ...Molecular mass = the sum of the atomic masses of each atom in the molecule. Therefore, the molecular mass of water, H 2 O, is equal to the sum of the atomic masses of two hydrogen atoms and one oxygen atom, which can be found on the periodic table. Molecular mass H 2 O. = 2 (1.00794) + 15.9994 = 18.0153. Notice that the atomic mass …
Feb 16, 2019 ... Molar Mass in Three Easy Steps: • How to Calculate Molar... • Understanding the Mole: • Understanding the Mole... • Moles - Gram Conversions .... Good websites to download free music
31.998. Total Mass. 31.998. The molar mass of O2 (Molecular Oxygen) is: 31.998 grams/mol. See also our theoretical yield calculator for chemical reactions (probably your next stop to finish the problem set).Daily news. What to watch for today Al Jazeera journalists go back on trial in Egypt. Mohamed Fahmy and Baher Mohamed go back on the stand on charges of harming national security. ...The first step to finding the molar mass is to count the number of each atom present in a single molecule using the chemical formula, 2Mg + O2 + 2MgO: 2. Find Atomic Mass of Each Element. Next, using the periodic table, find the atomic mass in g/mol of each element (the molar mass of an element is equal to its atomic mass): 3.May 10, 2023 · For example, the molar mass of water (H_2O) can be calculated by adding up the molar masses of two hydrogen atoms and one oxygen atom. The atomic mass of hydrogen is 1.01\text{ amu} , and the atomic mass of oxygen is 16.00\text{ amu} . O (Oxygen) 15.9994. 3. Compute Mass of Each Element. 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 C12H22O11: Molar Mass (g/mol) C (Carbon) 12 × 12.0107 = 144.1284. H (Hydrogen)The induvidual gas constant, R, for a gas can be calculated from the universal gas constant, R u ( given in several units below ), and the gas molecular weight, M gas : R = R u /M gas [1] In the imperial system the most common units for the individual gas constant are ft lb/slug o R . In the SI system the most common units are J/kg K .The molecular weight of a pure compound is determined from its chemical formula and the atomic weights of its elements. The atomic weights of the elements found in organic substances are C = 12.011, H = 1.008, S = 32.065, O = 15.999, and N = 14.007. M ethanol = 2*12.011 [kg/kmol] + 6*1.008 [kg/kmol] + 1*15.999 [kg/kmol] = 46.069 [kg/kmol] See ...Aug 8, 2017 ... This chemistry video tutorial explains how to calculate the molar mass of a compound. It contains plenty of examples and practice problems.3. Compute Mass of Each Element. 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 2Al + O2: Molar …3. Compute Mass of Each Element. 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 2Al + O2: Molar Mass (g/mol) Al (Aluminium/Aluminum) 2 × 26.9815386 = 53.9630772. O (Oxygen) 2 × 15.9994 = 31.9988. 4. Compute Mass of Each Element. 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 KClO3: Molar Mass (g/mol) K (Potassium) 1 × 39.0983 = 39.0983. Cl (Chlorine)Jul 22, 2022 · For example, the atomic mass of an oxygen atom is 16.00 amu; that means the molar mass of an oxygen atom is 16.00 g/mol. Further, if you have 16.00 grams of oxygen atoms, you know from the definition of a mole that your sample contains 6.022 x 10 23 oxygen atoms. The molar mass of a substance is defined as the mass of 1 mol of that substance, expressed in grams per mole, and is equal to the mass of 6.022 × 10 23 …16 u × 1.6605 ×10–24 g 1 u = 2.66 ×10–23 g (per oxygen atom) 16 u × 1.6605 × 10 – 24 g 1 u = 2.66 × 10 – 23 g (per oxygen atom) Example 2.9.3 2.9. 3: Relative masses from atomic weights. Suppose that we have N N carbon atoms, where N N is a number large enough to give us a pile of carbon atoms whose mass is 12.0 grams.Example: calculating molar mass. Let's calculate the molar mass of carbon dioxide (CO 2): Carbon (C) has an atomic mass of about 12.01 amu. Oxygen (O) has an atomic mass of about 16.00 amu. CO 2 has one carbon atom and two oxygen atoms. The molar mass of carbon dioxide is 12.01 + (2 × 16.00) = 44.01 g/mol. Lesson on computing molar massThe relative atomic mass of an element close element A substance made of one type of atom only., symbol A r, ... (A r = 12) and two oxygen atoms (A r = 16): M r of CO 2 = 12 + 16 + 16 = 44.Example: calculating molar mass. Let's calculate the molar mass of carbon dioxide (CO 2): Carbon (C) has an atomic mass of about 12.01 amu. Oxygen (O) has an atomic mass of about 16.00 amu. CO 2 has one carbon atom and two oxygen atoms. The molar mass of carbon dioxide is 12.01 + (2 × 16.00) = 44.01 g/mol. Lesson on computing molar mass.