Equivalent weight The mass

Equivalent weight the mass (in grams) of one equivalent of an acid or a base. 

One gram-equivalent (or pound-equivalent) represents the mass in grams (or pounds) of a material that is numerically equal to its equivalent weight. 

Dalton. Dalton, Da, is a molecular mass unit, widely used in Biochemistry. A dalton is equivalent to the mass of a hydrogen atom, 1.66 x 10"24 g. The relative molecular mass or molecular weight, Mr, is a mass ratio, expressed by a number without dimensions. Mr 10.000 would be equivalent to 10 000 Da or 10 kDa. 

The size of protein molecules, as determined by their molecular weight, also provides us with a clue about their allergenic potential. And this is where daltons come in. Named after John Dalton, the British scientist who introduced the idea that elements are made up of atoms, the dalton is the fundamental unit of molecular mass (see p. 19). One dalton is one-twelfth the mass of an atom of carbon-12 (the carbon isotope that has six protons and six neutrons in its nucleus), and it is roughly equivalent to the mass of a hydrogen atom. Most allergens have molecular weights in the ten thousand to forty thousand dalton range. 

Hydrophilic precipitated silicas contain between 2-10 wt.% of physically adsorbed water, hydrophilic fumed silicas only up to 2%. After 2 h of drying in a drying cabinet at 105°C, the physically adsorbed water is removed. The weight difference before and after drying is equivalent to the mass of physically bonded water (method according to ISO 787/2, ASTM D 280) and is... 

Faraday s second law of electrolysis For a given quantity of electricity (electric charge), the mass of an elemental material altered at an electrode is directly proportional to the element s equivalent weight. The equivalent weight of a substance is its molar mass divided by an integer that depends on the reaction undergone by the material [1]. 

In most analyses, each FAME can be expressed as a weight percentage of the total FAMEs represented in the chromatogram. The areas under the GC peaks are approximately equivalent to the masses of the FAMEs they represent. Therefore, the area percentage of each peak (as a... 

Accuracy has to be carefully defined, particularly for a (drop or particle) population containing a range of sizes. Tlie simplest description is via some appropriate mean size such as the Sauter Mean Diameter (d32, particle with the same volume /surface area ratio as ensemble of particles, sphere equivalent) or the mass median diameter (dso, size below which lie 50% by weight of the sample). The next step is to consider a second parameter describing the width of the distribution. A simple definition is a dimensionless span,... 

Faradaj constantEis the amount of charge that transfers when an equivalent weight of active mass reacts, 96, 485.3 C/g-equiv = 26.8015 Ah/g-equiv ). 

In tliis step, the e.xposure assessor calculates clicmical-specific c.xposurcs for each e.xposure pathway identified in step 2. As described in the last chapter, e.xposure estimates arc expressed in terms of the mass of substance in contact with the body per unit body weight per unit lime ( e.g., mg chemical per kg body weight per day. also e.xpressed as mg/kg-day). These e.xposure estimates are termed intakes (for tlie purposes of tliis text) and represent tlie normalized e.xposure rate. Several terms common in other EPA documents and Uie literature are equivalent or related to intake arc provided below. 

A considerable decrease in platinum consumption without performance loss was attained when a certain amount (30 to 40% by mass) of the proton-conducting polymer was introduced into the catalytically active layer of the electrode. To this end a mixture of platinized carbon black and a solution of (low-equivalent-weight ionomeric ) Nafion is homogenized by ultrasonic treatment, applied to the diffusion layer, and freed of its solvent by exposure to a temperature of about 100°C. The part of the catalyst s surface area that is in contact with the electrolyte (which in the case of solid electrolytes is always quite small) increases considerably, due to the ionomer present in the active layer. 

The equivalent weight of a substance is the mass in grams of 1 equivalent of the substance. The equivalent weight is often a useful value to characterize a substance. 

One mole of HX is 25g 0.500mol of H2X2 is also 25g. You cannot tell from the mass which is the formula of the acid. In either case, the equivalent weight of the acid is 25g/cquivalent. The equivalent weight of H X2 is given by... 

Resolutions in the range of 10,000 to 20,000 are achievable with modem time-of-flight mass spectrometry (TOFMS). Fourier transform ion cyclotron resonance mass spectrometry (FTICRMS) is more costly but capable of resolutions exceeding 100,000. Resolutions exceeding 10,000 can provide low to sub parts-per-million mass accuracies. One ppm is equivalent to a mass accuracy of 0.001 for a molecular weight of 1,000 Da. 

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