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(physical chemistry)
The numerical relationship of elements and compounds as reactants and products in chemical reactions.



in chemistry, the study of the quantitative relationships between the weights (volumes) of reacting substances. Stoichiometry includes the derivation of chemical formulas and chemical equations, and its principles are used in the calculations of chemical analysis. The term “stoichiometry” was introduced by J. Richter in his book Anfangsgründe der Stöchiometrie (vols. 1–3, 1792–94), in which he synthesized the results of his determinations of the weights of acids and bases during the formation of salts.

The major postulates of stoichiometry are derived from Avo- gadro’s law, Gay-Lussac’s law of combining volumes, the law of multiple proportions, the law of definite proportions, the principle of the conservation of mass, and the law of equivalent proportions. The rules of stoichiometry govern all calculations related to chemical equations. Stoichiometric calculations are widely used in chemical engineering and metallurgy.

References in periodicals archive ?
Like dehydration, the amount of dedolomite which can be produced due to pressure solution is then primarily defined by the reaction stoichiometry as well as the porosity within the dedolomite.
Chromosome stoichiometry (Becskei et al., 2005; Pavelka et al., 2010; Chester et al., 2012) can be used as a gauge of genome amplification which can be measured in numerically complete multiples of n-aggregate ploidal complements within cells (Xi et al., 2011).
DiTMPTA was used as the acceptor at a stoichiometry of 1:1 donor to acceptor ratio.
Looking at the interaction between the flame and flow during the combustion period, differences between lean cases and stoichiometry case are also evident.
As shown as an example in Figure 4, a lean sweep was performed of each fuel blend from stoichiometry and 0% EGR at every 0.1 lambda until the combustion stability exceeded 5% COV of IMEP.
With further lithium intercalation, there is more negative shift in the entropy (-9.36 J x [mol.sup.-1] x [K.sup.-1] with graphite intercalation compound stoichiometry of [Li.sub.0.222][C.sub.6]) which indicates more ordering of intercalated lithium in graphite.
The flame could be stabilized in equivalent ratio of [phi] = 1.1 to [phi] = 1.6, which was significantly high, considering the situation above was within stoichiometry condition.
Pokhodnya, "Stoichiometry and phase purity control of radio frequency magnetron sputter deposited Ba0.45Sr0.55TiO3 thin films for tunable devices," Journal ofApplied Physics, vol.
Assuming 1: 1 stoichiometry, the stability constant of the complex ([K.sub.stab]) can be determined using the phase-solubility diagram according to the following equation:
As was shown in our previous work, these curves depend on the anode stoichiometry [8].
For a typical stoichiometry of 2.0, the difference between the flow rates at inlet and outlet could be as high as 50% [10].
Another reason for the change can be due to difference in the stoichiometry among enamel and synthetic hydroxyapatite.