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nature : said the chemical reaction conditions and thermal effects of the chemical reaction equation. Formula Note participating in the response of the material from the state, pressure, temperature and heat, if needed for the solution with concentration. Respectively g, l, s, said gas, liquid, solid, solid substances should be annotated crystal. For example, the heat generated CO2 chemical equation can be written as C (graphite) + O2 (g) �CO2 (g) �H θ 298 =- 393.513 kJ / Mount # H said this reaction thermal effects such as pressure, marked θ said state standards, under Standard 298, said the reaction temperature is open 298.15 (25 ° C), said the negative reaction exothermic.
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