{"id":5973,"date":"2020-10-13T12:15:38","date_gmt":"2020-10-13T06:45:38","guid":{"rendered":"http:\/\/astan.lk\/al_virtualclassroom\/?p=5973"},"modified":"2020-10-13T12:15:27","modified_gmt":"2020-10-13T06:45:27","slug":"enthalpy","status":"publish","type":"post","link":"https:\/\/astan.lk\/al_virtualclassroom\/enthalpy\/","title":{"rendered":"Concepts related to enthalpy"},"content":{"rendered":"

\u2022 The portion of the universe selected for study is called the system.<\/p>\n

\u2022 Rest of the universe other than the portion selected for study is called the environment.<\/p>\n

\u2022 The surface that separates the system and the environment is called the boundary.<\/p>\n

\u2022 Systems where there is an exchange of energy, matter and work across the boundary are called open \u00a0 \u00a0 \u00a0 \u00a0systems.<\/p>\n

\u2022 Systems where only energy and work can exchange across the boundary are called closed systems. (i.e. \u00a0 Boundary is impermeable to matter.)<\/p>\n

\u2022 Systems where there is no exchange of energy, matter or work across the boundary are called isolated \u00a0 \u00a0systems.<\/p>\n

\"pic323\"<\/a><\/p>\n

 <\/p>\n

\u2022 The properties that depend upon the amount of matter are named extensive properties. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Examples- mass, volume, heat capacity<\/p>\n

\u2022 The properties that are independent of the amount of matter are named intensive properties. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Examples : temperature, pressure, density, viscosity, molar volume, molar heat capacity<\/p>\n

\u2022 Description of the temperature, pressure and composition of the system is called the state of the system. This information is specific for a particular system.<\/p>\n

\u2022 The properties with specific values for the state in which a system exits are called state functions. These properties do not depend on the history of the system.<\/p>\n

\u2022 The change in a function of state depends only on its initial state and final state. It is independent of the route followed.<\/p>\n

\u2022 Volume, temperature, density, refractive index, enthalpy, entropy, etc. are examples for functions of state.<\/p>\n

\u2022 The quantity of heat supplied to a system or given out from a system under the condition of constant pressure is called the enthalpy change (\u2206H). This is a thermodynamic property and a function of state.<\/p>\n

\u2022 The enthalpy change ( \u2206H ) associated with a reaction is given by the difference in enthalpy of the products and reactants<\/p>\n

\u0394H =\u00a0\u0394Hproducts<\/sub> –\u00a0\u0394Hreactants<\/sub><\/strong><\/p>\n

Enthalpy change associated with a reaction ; if \u2206H < 0 the reaction is exothermic and if \u2206H > 0 the reaction is endothermic.<\/p>\n

\u2022 According to IUPAC convention, enthalpy changes are reported for unit extent of reaction in kJ mol-1<\/sup>.<\/p>\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

\u2022 The portion of the universe selected for study is called the system. \u2022 Rest of the universe other than the portion selected for study is called the environment. \u2022 The surface that separates the system and the environment is called the boundary. \u2022 Systems where there is an exchange of energy, matter and work […]<\/p>\n","protected":false},"author":842,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[14,1660],"tags":[],"class_list":["post-5973","post","type-post","status-publish","format-standard","hentry","category-chemistry","category-unit-05"],"acf":[],"yoast_head":"\nConcepts related to enthalpy - Learning & Education Portal<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/astan.lk\/al_virtualclassroom\/enthalpy\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Concepts related to enthalpy - 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