The Enthalpies of Combustion and Formation of the Mono-chlorobenzoic Acids.

Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry Pub Date : 1974-11-01 DOI:10.6028/jres.078A.044

Walter H Johnson, Edward J Prosen

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引用次数: 7

Abstract

The enthalpies of combustion of o-, m-, and p-chlorobenzoic acid have been determined in an adiabatic rotating-bomb calorimeter. The enthalpies of formation have been obtained by combination of the experimental data with the accepted values for the enthalpies of formation of water, carbon dioxide, and aqueous hydrochloric acid. The results of other investigators are discussed briefly. The resulting values and their estimated 95 percent confidence limits are as follows: o-Chlorobenzoic acidm-Chlorobenzoic acidp-Chlorobenzoic acid ΔHc° (25 °C)-3087.91 ± 0.69 kJ/mol-3068.05 ± 1.53 kJ/mol-3064.40 ± 0.66 kJ/molΔHf° (25 °C)-404.83 ± 0.74 kJ/mol-424.59 ± 1.55 kJ/mol-428.16 ± 0.72 kJ/mol. Where ΔHc° corresponds to the process: -404.61-424.37-429.94C₇H₅O₂Cl(c) + 7 O₂(g) + 198 H₂O(liq) → 7 CO₂(g) + [HC1 + 200 H₂O](liq).

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一氯苯甲酸的燃烧焓和生成。

在绝热旋转量热计中测定了邻、间和对氯苯甲酸的燃烧焓。形成焓是通过将实验数据与水、二氧化碳和盐酸水溶液的形成焓的可接受值相结合而获得的。简要讨论了其他研究人员的结果。所得值及其估计的95%置信限如下：邻氯苯甲酸-氯苯甲酸-对氯苯甲酸ΔHc°（25°C）-3087.91±0.69 kJ/mol-3068.05±1.53 kJ/mol-30 64.40±0.66 kJ/molΔHf°（25℃）-404.83±0.74 kJ/mol-424.59±1.55 kJ/mol-428.16±0.72 kJ/mol。其中ΔHc°对应于过程：-404.61-424.37-429.94C7H5O2Cl（c）+7 O2（g）+198 H2O（liq）→ 7 CO2（g）+[HC1+200 H2O]（liq）。

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Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry

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