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Atomic number Element Molar mass Formal standard atomic weight s.a.w., formal short Note Z calculated; g·mol −1 A r, standard [2] A r, abridged and conventional [2]; C 9 H 8 O 4: 180.159 g·mol −1
of formation, Δ f H o liquid: −393.5kJ/mol Standard molar entropy, S o liquid: 213.7J/(mol K) Heat capacity, [10] c p: 80—150 J/(mol·K) at 220—290 K Gas properties Std enthalpy change of formation, Δ f H o gas: −393.52 kJ/mol Standard molar entropy, S o gas: 213.79 J/(mol·K) Heat capacity, [11] [12] c p: 33.89 J/(mol K) at –75 °C ...
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.
The molecular mass and relative molecular mass are distinct from but related to the molar mass. The molar mass is defined as the mass of a given substance divided by the amount of the substance, and is expressed in grams per mol (g/mol). That makes the molar mass an average of many particles or molecules (potentially containing different ...
A solution with 1 g of solute dissolved in a final volume of 100 mL of solution would be labeled as "1%" or "1% m/v" (mass/volume). This is incorrect because the unit "%" can only be used for dimensionless quantities. Instead, the concentration should simply be given in units of g/mL.
For example, 50 g of zinc will react with oxygen to produce 62.24 g of zinc oxide, implying that the zinc has reacted with 12.24 g of oxygen (from the Law of conservation of mass): the equivalent weight of zinc is the mass which will react with eight grams of oxygen, hence 50 g × 8 g/12.24 g = 32.7 g.
The molar mass constant, usually denoted by M u, is a physical constant defined as one twelfth of the molar mass of carbon-12: M u = M(12 C)/12. [1] 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.
Cyclopentadienyliron dicarbonyl dimer is an organometallic compound with the formula [(η 5-C 5 H 5)Fe(CO) 2] 2, often abbreviated to Cp 2 Fe 2 (CO) 4, [CpFe(CO) 2] 2 or even Fp 2, with the colloquial name "fip dimer".