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  2. Molar mass - Wikipedia

    en.wikipedia.org/wiki/Molar_mass

    The molar mass of atoms of an element is given by the relative atomic mass of the element multiplied by the molar mass constant, M u ≈ 1.000 000 × 10 −3 kg/mol ≈ 1 g/mol. For normal samples from Earth with typical isotope composition, the atomic weight can be approximated by the standard atomic weight [ 2 ] or the conventional atomic weight.

  3. Amount of substance - Wikipedia

    en.wikipedia.org/wiki/Amount_of_substance

    Historically, the mole was defined as the amount of substance in 12 grams of the carbon-12 isotope.As a consequence, the mass of one mole of a chemical compound, in grams, is numerically equal (for all practical purposes) to the mass of one molecule or formula unit of the compound, in daltons, and the molar mass of an isotope in grams per mole is approximately equal to the mass number ...

  4. Stoichiometry - Wikipedia

    en.wikipedia.org/wiki/Stoichiometry

    By definition, the atomic mass of carbon-12 is 12 Da, giving a molar mass of 12 g/mol. The number of molecules per mole in a substance is given by the Avogadro constant , exactly 6.022 140 76 × 10 23 mol −1 since the 2019 revision of the SI .

  5. Chromium(III) oxide - Wikipedia

    en.wikipedia.org/wiki/Chromium(III)_oxide

    Molar mass: 151.9904 g/mol Appearance light to dark green, fine crystals ... Chromium(III) oxide (or chromia) is an inorganic compound with the formula Cr 2 O 3.

  6. Chromium(III) iodide - Wikipedia

    en.wikipedia.org/wiki/Chromium(III)_iodide

    Chromium triiodide is prepared by the direct reaction of chromium metal with an excess of iodine.The reaction is conducted at 500 °C: 2 Cr + 3 I 2 → 2 CrI 3. To obtain high purity samples, the product is thermally decomposed at 700 °C to sublime out chromium(II) iodide.

  7. Molar mass constant - Wikipedia

    en.wikipedia.org/wiki/Molar_mass_constant

    The molar mass of an element or compound is its relative atomic mass (atomic weight) or relative molecular mass (molecular weight or formula weight) multiplied by the molar mass constant. The mole and the atomic mass unit (dalton) were originally defined in the International System of Units (SI) in such a way that the constant was exactly 1 g ...

  8. Chromium(III) sulfide - Wikipedia

    en.wikipedia.org/wiki/Chromium(III)_sulfide

    Chromium(III) sulfide is the inorganic compound with the formula Cr 2 S 3. It is a brown-black solid. It is a brown-black solid. Chromium sulfides are usually nonstoichiometric compounds , with formulas ranging from CrS to Cr 0.67 S (corresponding to Cr 2 S 3 ).

  9. Equivalent weight - Wikipedia

    en.wikipedia.org/wiki/Equivalent_weight

    sulfuric acid has a molar mass of 98.078(5) g mol −1, and supplies two moles of hydrogen ions per mole of sulfuric acid, so its equivalent weight is 98.078(5) g mol −1 /2 eq mol −1 = 49.039(3) g eq −1. potassium permanganate has a molar mass of 158.034(1) g mol −1, and reacts with five moles of electrons per mole of potassium ...