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However, because a hydrogen peroxide molecule contains two oxygen atoms, as opposed to the water molecule, which has only one, the two substances exhibit very different properties. For example, water, H 2O, and hydrogen peroxide, H 2O 2, are alike in that their respective molecules are composed of hydrogen and oxygen atoms. The identity of a substance is defined not only by the types of atoms or ions it contains, but by the quantity of each type of atom or ion. View available translations of the content. Download the content in PDF, Microsoft Word, or other format. Questions and Tasks Add a note to the content. Kinetic Molecular Theory, Real GasesĬontent Foreword Atoms Introduction Matter Measurement The Atom Periodic Table Moles & Mass Light Blackbody Radiation, Photoelectric Effect Atomic Spectra, Bohr Model Orbitals & Quantum Numbers Electron Configurations Periodic Trends Molecules Bonding Nomenclature Lewis Structures Part 1 Lewis Structures Part 2 Molecular Shape Polarity Organic Molecules Isomers Valence Bond Theory Molecular Orbital Theory Interactions Pressure & Gas Laws Combined & Ideal Gas Laws Dalton's Law, Graham's Law, Henry's Law Kinetic Molecular Theory, Real Gases Intermolecular Forces Properties of Water Applications of IMF Phase Diagrams Reactions Stoichiometry Limiting Reactants, % Yield % Composition, Empirical Formulas Energy, Heat, and Work Calorimetry Part 1 Calorimetry Part 2 Enthalpy Part 1 Enthalpy Part 2 Entropy Gibb's Free Energy Climate and Human Impacts Search within this publication Search the entire site Blackbody Radiation, Photoelectric Effect CO 2 has one carbon atom and two oxygen atoms.Oxygen (O) has an atomic mass of about 16.00 amu.Carbon (C) has an atomic mass of about 12.01 amu.Let's calculate the molar mass of carbon dioxide (CO 2): Add them together: add the results from step 3 to get the total molar mass of the compound.Calculate molar mass of each element: multiply the atomic mass of each element by the number of atoms of that element in the compound.The atomic mass is usually found on the periodic table and is given in atomic mass units (amu). Find atomic masses: look up the atomic masses of each element present in the compound.For example, water is H 2O, meaning it contains two hydrogen atoms and one oxygen atom. Identify the compound: write down the chemical formula of the compound.One mole contains exactly 6.022 ×10 23 particles (Avogadro's number) Mole is a standard scientific unit for measuring large quantities of very small entities such as atoms and molecules.Molar mass ( molar weight) is the mass of one mole of a substance and is expressed in g/mol.
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(1 u is equal to 1/12 the mass of one atom of carbon-12) Molecular mass ( molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u).To calculate molecular weight of a chemical compound enter it's formula, specify its isotope mass number after each element in square brackets.Įxamples of molecular weight computations: Molar mass calculator also displays common compound name, Hill formula, elemental composition, mass percent composition, atomic percent compositions and allows to convert from weight to number of moles and vice versa.Ĭomputing molecular weight (molecular mass) Functional groups: D, Ph, Me, Et, Bu, AcAc, For, Tos, Bz, TMS, tBu, Bzl, Bn, DmgĮxamples of molar mass computations: NaCl, Ca(OH)2, K4, CuSO4*5H2O, nitric acid, potassium permanganate, ethanol, fructose, caffeine, water.Capitalize the first letter in chemical symbol and use lower case for the remaining letters: Ca, Fe, Mg, Mn, S, O, H, C, N, Na, K, Cl, Al. Copper is a reddish-brown metal with a shiny surface.Ĭomputing molar mass (molar weight)To calculate molar mass of a chemical compound enter its formula and click 'Compute'.