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錳橄欖石的合成及其與鹽酸反應熱的測定

Synthesis of Tephroite and Determination of Heat of Reaction of Tephroite with Hydrochloric Acid

  • 摘要: 報導了純錳橄欖石的合成及鑒定。這種合成的純錳欖橄石在室溫時可以被鹽酸,硫酸完全分解。由量熱法測得此錳橄欖石和稀鹽酸反應時放出(169±3.5)kJ.mol-1的熱。這個由實驗測得的反應熱與按文獻數據算出的H2180值相近。
    由測得的反應熱值算出的Mn2SiO4的品格能是-8045kJ.mol-1,SiO44-g的水合焓是-4439.3kJ.mol-1

     

    Abstract: In this article, the synthesis and characterisation of pure tephroite are discussed. At room temperature, the synthesized pure tephroise be decomposed completely by dilute hydrochloric acid,salphuric acid or phosphoric acid. It is found by calorimetry that the reaction of tephroite with hydrochloric acid releases the heat to be 160.1±3.5 kJ per mole. The determined value of heat of reaction is close to the calculated value of △H°298 based on deta from literature.
    From the deterarined value of the heat of reaction, the laitice enargy of Mn2SiO4 is calculated to be -8045 kJ·mol-1, the enthalpy of hydration of SiO44- (g) is -4439.3 kJ.mol-1.

     

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