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Explain the standard enthalpy of reactions. |
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Answer» Solution :Enthalpy of a reaction depends on the conditions under which a reaction is CARRIED out. It is, THEREFORE, necessary that we MUST specify some standard conditions. The standard enthalpy of reaction is the enthalpy change for a reaction when all the participating substances are in their standard STATES. The standard state of a substance at a specified TEMPERATURE is its pure form at 1 bar. For example, the standard state of liquid ethanol at 298 K is pure liquid ethanol at 1 bar , standard state of solid iron at 500 K is pure iron at 1 bar. Usually data are taken at 298 K. Standard conditions are denoted by adding the superscript `Theta` to the symbol `Delta H `, e.g., `Delta H^(Theta)` |
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