Enthalpy change

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    28-Aug-2014

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<ul><li> Enthalpy Change(H)<br /></li> <li> Enthalpy Change<br />Key Concepts<br /><ul><li>The heat content of a chemical reaction is called the enthalpy (symbol: H) </li> <li> The enthalpy change (H) is the amount of heat released or absorbed when a chemical reaction occurs at constant pressure. </li> <li> H = H(products) - H(reactants) </li> <li> The units are usually given as kJ mol-1 (kJ/mol) or sometimes as kcal mol-1 (kcal/mol)1 calorie (1 cal) = 4.184 joules (4.184 J) </li> <li> Standard enthalpy change(H);Energy changes for any reaction which are measured under standard conditions of temperature and pressure25oC (298K) - 101.3 kPa (1 atmosphere) - 1 mol dm-3</li></ul></li></ul>

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