{"id":403098,"date":"2024-12-31T18:04:41","date_gmt":"2024-12-31T18:04:41","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/403098\/"},"modified":"2024-12-31T18:10:04","modified_gmt":"2024-12-31T18:10:04","slug":"403098","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/403098\/","title":{"rendered":"Reply To: Reference Enthalpy Values in Material Properties database Ansys Fluent"},"content":{"rendered":"<p>&lt;p&gt;Hi:&lt;\/p&gt;&lt;p&gt;These are the real formation enthalpies.&nbsp; Watch out for the units&hellip;.&lt;\/p&gt;&lt;p&gt;The standard enthalpy of formation of water at 25 C and 1 atm&nbsp; is -285.8 kJ\/mol. This is because the reaction (of O2 and H2) that creates a molecule of water releases heat, so water actually ends up at a lower energy state than its components.&nbsp;&lt;\/p&gt;&lt;p&gt;The units of the Fluent enthalpy of formation are in [J\/kgmol], however, so we must convert:&lt;\/p&gt;&lt;p&gt;Converting the units:&nbsp;&lt;\/p&gt;&lt;p&gt;Hf = -285.8 kJ\/mol&nbsp; *<em> 1000 kJ\/J <\/em>&nbsp;*1000 mol\/kmol = -2.85e+08 J\/kmol&lt;\/p&gt;&lt;div class=&#8221;&rdquo;CM8kHf&#8221; data-hveid=&#8221;&rdquo;CEoQAw&rdquo;&#8221;&gt;&lt;div data-expression=&#8221;&rdquo;-285.8&#8243;&gt;&nbsp;&lt;\/div&gt;&lt;\/div&gt;&lt;p&gt;&lt;span class=&#8221;&rdquo;M5tQyf&rdquo;&#8221;&gt;Regards,&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span class=&#8221;&rdquo;M5tQyf&rdquo;&#8221;&gt;Judy&lt;\/span&gt;&lt;\/p&gt;&lt;div class=&#8221;&rdquo;CM8kHf&#8221; data-hveid=&#8221;&rdquo;CEoQAQ&rdquo;&#8221;&gt;&lt;div data-expression=&#8221;&rdquo;25^\\circ&#8221;&gt;&nbsp;&lt;\/div&gt;&lt;\/div&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-403098","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi:These are the real formation enthalpies. 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Watch out for the units\u2026.The standard enthalpy of formation of water at 25 C and 1 atm is -285.8 kJ\/mol. This is because the reaction (of O2 and H2) that creates a molecule of water releases heat, so water actually ends up at a lower energy state than its\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/403098\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-12-31T18:04:41+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-12-31T18:10:04+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: Reference Enthalpy Values in Material Properties database Ansys Fluent | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hi:These are the real formation enthalpies. Watch out for the units\u2026.The standard enthalpy of formation of water at 25 C and 1 atm is -285.8 kJ\/mol. 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