3.01 × 1023 molecules H2O 8.32 × 1020 formula units CaBr2 1.93 × 1026 molecules XeF6 x= 22.4 Litres. Calculate the molecular mass of Ca(OH) 2. Carbon Dioxide = CO2 Next determine the mass of each element present in the compound and the molar mass of the compound. 2. Oxygen is one of the most abundant elements on planet Earth and in the universe. You can refer to your periodic table for the mass number. 1. Oxygen (O2) has a molar mass of 32.0 g/mol. Use the periodic table to determine how many atoms of phosphorus (P) are in a sample that has a mass of 172.90 g. Select the correct mass for each of the samples described below. In this case, oxygen has a mass number of 16.0. First determine the chemical formula for carbon dioxide. Do a quick conversion: 1 moles Oxygen = 15.9994 gram using the molecular weight calculator and the molar mass of O. The molar mass of oxygen is the mass of one mole of oxygen. Or, treating this like an algebra problem, divide both sides by (1 mol Oxygen), and you get: 32.00 grams Oxygen / 1 mole Oxygen = 1. When you look up the atomic weight of oxygen, you find it is 16.00 g. Therefore, the molar mass of oxygen is: 2 x 16.00 g = 32.00 g Molar Mass … What is the root-mean-square speed of an oxygen molecule at a temperature of 299 K? To understand why knowing oxygen’s molar mass is important, we first have to understand what molar mass is and how it relates to doing calculations in chemistry.. What Is Molar Mass? Mass of 1 litre of oxygen at STP = 1.429 g. Mass of 1 mol of oxygen = 32 g. Volume : Mass. 429 g. x : 32 g. x= 32/1.429. 1 litre : 1. Oxygen forms a divalent molecule, so this is the mass of one mole of O 2. The molar mass simply means the mass of a substance in one mole (in grams). Of oxygen "molecules", 32.00 g*mol^-1. ). Here, we're looking for mass (grams of Oxygen). Oxygen has an atomic number of eight, and the molar mass of oxygen is approximately 15.9994. What is its average translational kinetic energy at that speed? Usually to find an ELEMENT's molar mass, you look at your periodic table and look for that element's atomic mass (which will equal the molar mass) But because Oxygen is a diatomic element (O2), then you have to do 15.999 x 2 = 31.998 or just 16 x 2 = 32. C = 1 × 12.01 = 12.01 g/mol O = 2 × 16.00 = 32.00 g/mol 12.01 g/mol + 32.00 g/mol = 44.01 g/mol Finally, determine the percent of carbon. That means, 1 mol Oxygen = 32.00 grams Oxygen. We know that the oxygen gas we breathe is the diatomic molecule, O_2; in fact most common elemental gases are diatomic (what are the exceptions to this generalization? REGISTER NOW ... Two atomic mass of oxygen= 16(2) =32 Total molecular mass of carbon dioxide =C+O = 12u +32u =44u (ans) 4. As you point out, Oxygen has a molar mass of 32.00 grams per mole. 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