26. Chap 5.3,4, 5 ecampus

26. Chap 5.3,4, 5 ecampus - the products and the state of...

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The Truth about Enthalpy 1. Enthalpy is an extensive property. 1. H for a reaction in the forward direction is equal in size, but opposite in sign, to H for the reverse reaction. 2. H for a reaction depends on the state of the products and the state of the reactants.
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The Truth about Enthalpy Enthalpy is an extensive property. N 2 ( g ) + 3H 2 ( g ) → 2NH 3 ( g ) Δ H = -91.8 kJ 2N 2 ( g ) + 6H 2 ( g ) → 4NH 3 ( g ) Δ H = 2(-91.8 kJ) = -183.6 kJ
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The Truth about Enthalpy H for a reaction in the forward direction is equal in size, but opposite in sign, to H for the reverse reaction. N 2 ( g ) + 3H 2 ( g ) → 2NH 3 ( g ) Δ H = -91.8 kJ 2NH 3 ( g ) → N 2 ( g ) + 3H 2 ( g ) Δ H = +91.8 kJ Reverse the sign when reversing the process.
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The Truth about Enthalpy H for a reaction depends on the state of
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Unformatted text preview: the products and the state of the reactants. 2H 2 ( g ) + O 2 ( g ) 2H 2 O ( l ) H = -571.6 kJ 2H 2 ( g ) + O 2 ( g ) 2H 2 O ( g ) H = -483.6 kJ Stoichiometry and Enthalpy Calculate the amount of heat produced from 45.0 g of H 2 gas. 2H 2 ( g ) + O 2 ( g ) 2H 2 O ( g ) H = -483.6 kJ How many grams of nitrogen should be use to produce 1250 kJ of heat? N 2 ( g ) + 3H 2 ( g ) 2NH 3 ( g ) H = -91.8 kJ Specific Heats A hot-water bottle contains 750 g of water at 65C. If the water cools to body temperature (37C), how much heat could be transferred to sore muscles? The specific heat of water is 4.184 J/gC Heat...
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This note was uploaded on 02/20/2011 for the course CHEM 1411 taught by Professor Thopson during the Spring '11 term at École Normale Supérieure.

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26. Chap 5.3,4, 5 ecampus - the products and the state of...

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