We present several examples of how the probability distribution of an atomic weight or relative molecular mass may be characterized, and also how it may be used to evaluate the associated uncertainty.Īt its 2009 meeting in Vienna, the IUPAC Commission on Isotopic Abundances and Atomic Weights (CIAAW) resolved to express the standard atomic weight of ten elements – including hydrogen, carbon, and oxygen – by means of intervals that characterize the span of their atomic-weight values in so-called “normal” materials. When information about the provenance of the material, or other information about the isotopic composition needs to be taken into account, then this distribution may be non-uniform. This modeling choice is a reasonable and convenient default choice when a representative value of the atomic weight, and associated uncertainty, are needed in calculations involving atomic and relative molecular masses. In the absence of detailed knowledge about the isotopic composition of a material, or when such details may safely be ignored, the probability distribution assigned to the standard atomic weight intervals may be taken as rectangular (or, uniform). Rather, they convey states of knowledge about the elemental composition of “normal” materials generally, or about specific classes of such materials. These distributions, however, are not intended to reflect the natural variability of the abundances of the different isotopes in the earth’s crust or in any other environment. The assignment of suitable probability distributions to the atomic weight intervals is consistent with the CIAAW’s goal of emphasizing the variability of the atomic weight values in nature. However, it has become apparent that additional guidance would be helpful on how representative values should be derived from these intervals, and on how the associated uncertainty should be characterized and propagated to cognate quantities, such as relative molecular masses. Trending Questions A closed end manometer has a U tube with a sample of hydrogen gas in the bulb The difference in the height of the columns of mercury is 18.0 cm What is the pressure of the hydrogen gas in torr? What is the base for H2SO4? Which elements had a filled outermost shell? How many moles of excess sulfuric acid are left over after the complete reaction of 300.0 g of ammonia with 36.0 moles of sulfuric acid producing ammonium sulfate? What are the chemical properties of plutonium? Why is sulfur an element and not a compound? What is the mass number of neon-20? What is the difference between sterling and silver plate? What is the difference between mix and mixture? Can pure substances be separated physically? What are green diamonds called? This element has one less proton then sodium? The smallest particle of oxygen that behaves like oxygen is an oxygen? What is the balanced equation for CH3COONa plus HCl? How does evaporation purify water? Will Windex clean walls? Is global warming a chemical change? What is the most common inhaled poisons associated with fire? Atoms with electronegativity differences below 0.In 2009, the Commission on Isotopic Abundances and Atomic Weights (CIAAW) of the International Union of Pure and Applied Chemistry (IUPAC) introduced the interval notation to express the standard atomic weights of elements whose isotopic composition varies significantly in nature. That was less than a fifth the amount prescribed by herĭoctor, yet her potassium levels in her blood tests were just ![]() ![]() Potassium, about the same contained in 3.5 mEq of potassiumĬhloride. Gave her about 1/4 teaspoon of powered potassium gluconate mixed inĪ glass of water, which contained only about 135 mg elemental The large pills were hard for her to swallow. What you want as it may produce different effects in the body.įor example, my mother had been prescribed 20mEq of potassiumĬhloride by her doctor, which contains 781.960 mg of elemental So seeking the equivalent elemental potassium dosage may not be ![]() That said, the potassium in potassium gluconate is more easilyĪbsorbed by the body than is the potassium in potassium chloride, Potassium gluconate, which is generally expressed in mg.ĥ95 mg of potassium gluconate contains about 99mg of elementalġ89 mg of potassium chloride also contains about 99mg ofġ89 mg of potassium chloride is about 2.54 mEq You seem to be asking how translate a dose of potassiumĬhloride, which is often expressed as mEq's when prescribed as aĭrug, into an equivalent dose of potassium in supplemental How many meq's is 595 mg of potassium gluconate in pill Potassium 595mg equals how many potassium meq?
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