Chlorine relative atomic mass, 2

Example In an experiment, 5.60 g of iron combined with 10.65 g of chlorine gas to form a chloride of iron. Construct the equation for the reaction (relative atomic masses Fe = 56, Cl = 35.5). 

Q15 The amount of diclofenac that is being administered per tablet of Voltarol tablets containing 25 mg diclofenac sodium is (Diclofenac sodium has a molecular formula of C 4H,QCl2N02.Na relative atomic mass of carbon = 12.01 hydrogen = 1.008 chlorine = 35.45 nitrogen = 14.01 sodium = 22.99 and oxygen = 16.00.)... 

Q7 Each sachet of Dioralyte contains 0.47 g sodium chloride and 0.30 g potassium chloride. The amount in millimoles of chloride in one sachet is (relative atomic mass of sodium = 23 chlorine = 35 potassium = 39) ... 

Relative atomic masses silver, 108 nitrogen, 14 oxygen, 16 carbon, 12 chlorine, 35.5 calcium, 40 sodium, 23. 

The relative atomic mass of xenon is 131.3 58.5 (23 from sodium + 35.5 from chlorine)... 

The maximum Re—Cl bond length change is 0.026 A. It is calculated using the same procedures as described above. The relative atomic mass used to convert dimensionless A into angstrom units for AS, (18) is the sum of the masses of rhenium and chlorine. 

The relative atomic mass of chlorine is the weighted mean of the mass numbers of the two isotopes ... 

The relative atomic mass of an isotope such as f Cl is then measured with respect to the mass of the reference C atom. Chlorinc-35 has a mass that is 2.914071 limes greater than the mass of the carbon isotope. Therefore, the atomic mass of the chlorine isotope is... 

The relative isotopic mass is the mass of a single isotope of an element (relative to l/12th the mass of a carbon 12 atom), whereas the relative atomic mass is the average mass taking into account the isotopes of the element. The relative isotopic masses of the two chlorine isotopes are 35 and 37, but the relative atomic mass of chlorine is 35.5... 

Relative atomic mass of chlorine = 35.3 Relative molecular mass of Cl] = 2x35.5 = 71 Mass of 1 mole of chlorine. Cl] = 71 grams. 

The atomic weights listed in the periodic table are relative numbers ( C = 12.0000. ..) based upon the weighted average of naturally occurring isotopes (e.g., the atomic mass of chlorine is 35.45 reflecting the roughly 3 1 ratio of Cl to Cl). The isotope Cl has 17 protons (atomic number = 17) and 18 neutrons in its nucleus C1 has 17 protons and 20 neutrons. A more precise analysis combines the relative abundances and precise relative masses of the two stable nuclides of chlorine ( Cl 75.78 percent 34.968853. Cl 24.22 percent 36.965903) as follows Relative Atomic Mass of Chlorine 0.7578 (34.968853) + 0.2422 (36.965903) = 35.45 It is noteworthy that on rare occasions, lUPAC may introduce a very slight modification to the atomic mass provided for an element in the periodic table. The relative masses of the nuclides are known to... 

For example, the molar mass of sodium atoms is 22.99 g moh and the relative atomic mass of sodium is 22.99. The molar mass of iron(ii) ions, Fe, is 55.85 g moT and the relative atomic mass of iron is 55.85. The molar mass of chloride ions, Cl , is 35.45 gmol and the relative atomic mass of chlorine is 35.45. The removal or gain of electrons has no effect on the calculations. The mass of the electrons is negligible and is ignored. 

Fortunately, isotopic abundances as well as isotopic masses can be determined by mass spectrometry. The situation with chlorine, which has two stable isotopes, 0-35 and 0-37, is shown in Figure 3.2. The atomic masses of the two isotopes are determined in the usual way. The relative abundances of these isotopes are proportional to the heights of the recorder peaks or, more accurately, to the areas under these peaks. For chlorine, the data obtained from the mass spectrometer are... 

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