12/27/2023 0 Comments O2 molar mass(i) Your answer for part (h) should be three times as large as the answer for part (g). What is the average force the molecule exerts on one of the walls of the container? (Assume that the molecule’s velocity is perpendicular to the two sides that it strikes.) (f) What is the average force per unit area? (g) How many oxygen molecules traveling at this speed are necessary to produce an average pressure of 1 atm? (h) Compute the number of oxygen molecules that are contained in a vessel of this size at 300 K and atmospheric pressure. Convert grams C2H6 O2 to moles or moles C2H6 O2 to grams. What is (a) the average translational kinetic energy of an oxygen molecule at a temperature of 300 K (b) the average value of the square of its speed (c) the root-mean-square speed (d) the momentum of an oxygen molecule traveling at this speed? (e) Suppose an oxygen molecule traveling at this speed bounces back and forth between opposite sides of a cubical vessel 0.10 m on a side. This site explains how to find molar mass.Oxygen ( O 2 O_ O 2 ) has a molar mass of 32.0 g/mol. The reason is that the molar mass of the substance affects the conversion. To complete this calculation, you have to know what substance you are trying to convert. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100.Ī common request on this site is to convert grams to moles. If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. In an experiment, zinc chlorate decomposed according to the following chemical equation. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. ![]() This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. 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. These relative weights computed from the chemical equation are sometimes called equation weights. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula.įormula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction. ![]() 1 mole of sulfur dioxide molecules has a volume of 22.4 at STP So, 0,03125 moles has a volume of 0.03125 × 22.4 0.7 liters at STP So, 0.7 liters of sulfur dioxide are produced. When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. Example 05: What is the relative molecular mass of the gas. density of oxygen is equal to 1.429 kg/m³ at 0☌ (32☏ or 273.15K) at standard atmospheric pressure. In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together.įinding molar mass starts with units of grams per mole (g/mol). Equivalent molar concentration per liter About Oxygen Oxygen weighs 0.001429 gram per cubic centimeter or 1.429 kilogram per cubic meter, i.e.
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