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Why you measure enthalpy in H instead of H?
The symbol "H" is used to represent enthalpy in thermodynamics because it was historically derived from the term "heat content." The letter "H" is a representation of the overall heat energy of a system, which is more widely recognized and used in thermodynamic equations.
Why do we have to use molality for our calculations, instead of the more common unit of molarity?
Molality is used for calculations instead of molarity because it is a more accurate measure of concentration. Molarity can change with temperature, while molality remains constant. This makes molality more reliable for certain calculations, especially those involving changes in temperature.
Would the enthalpy change be different if solid sodium hydroxide pellets were added to hydrochloric acid instead of adding hydrochloric acid to sodium hydroxide solution?
No, the enthalpy change would be the same regardless of the order of mixing, as it is a state function. The enthalpy change for the neutralization reaction between hydrochloric acid and sodium hydroxide does not depend on the physical form in which the reactants are added.
Why is it difficult to determine the enthalpy change of thermal decomposition of potassium hydrogencarbonate to potassium carbonate?
It is difficult to determine the enthalpy change of thermal decomposition of potassium hydrogencarbonate because the reaction is typically very slow under standard conditions, making it hard to measure accurately. Additionally, the reaction may involve simultaneous side reactions, complicating the interpretation of experimental data. The reaction also releases multiple gaseous products, making it challenging to control and measure the enthalpy change accurately.
Why Do Medical Establishments Typically Use Percent Concentration instead of Molarity?
Medical establishments typically use percent concentration instead of molarity because percent concentration provides a more intuitive understanding of the amount of drug or substance in a given volume. This can be easier for healthcare professionals and patients to comprehend compared to molarity, which involves more complex calculations related to the molar mass and volume of a solution.
