Examples - Chapter 6

Examples - Chapter 6 - Example 6 1 Calculate the work...

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Example 6 - 1 Calculate the work done (on the system) in joules when 50.0 g of zinc dissolves in excess acid at 1.00 atm and 25 o C. Zn( s ) + 2H + ( aq ) Zn 2+ ( aq ) + H 2 ( g ) ________________________________________________________ 1
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Example 6 - 2 A gas expands and does P-V work on the surroundings equal to 585 J. At the same time it absorbs 435 J of heat from the surroundings. What is the change in energy of … (a) the system. (b) the surroundings. (c) the universe. ________________________________________________________ 2
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Example 6 - 3 Calculate the change in enthalpy , H , for the production of 1.00 mol of HBr( g ) from H 2 ( g ) and Br 2 ( l ), given the following thermochemical equation: H 2 ( g ) + Br 2 ( l ) 2HBr( g ) + 72.4 kJ ________________________________________________________ 3
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Example 6 - 4 Calculate the heat evolved by the combustion of 250 kg of coal ( i.e ., carbon), given the following thermochemical equation: C( s ) + O 2 ( g ) CO 2 ( g ) H o rxn = - 395.5 kJ/mol ________________________________________________________ 4
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Example 6 - 5 What is the value of E for the formation of 2 moles of NH 3 at 1 atm and 25 o C? N 2 ( g ) + 3H 2 ( g ) 2NH 3 ( g ) + 92.6 kJ 
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