Chapter 5 Sample Problems - Chapter 5(Sample Exercises...

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 Chapter 5: (Sample Exercises) 1. Calculate the change in the internal  energy of the system for a process in  which the system absorbs 140 J of heat  from the surroundings and does 85 J of  work on the surroundings.   E = q + W       = q (+ve: system absorbs heat from  surrounding);          W (-ve: work done on the surrounding)   E = 140 + (-85)
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      = 140 – 85 = + 55 J 2.  How much heat is released when 4.50 g of  methane gas is burned in a constant- pressure  system? CH 4  (g) +2O 2  (g)   CO 2  (g) + 2 H 2 O (l)    H= -  890 kJ Step 1: Using the above equation:
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1 mol CH gives - 890 kJ (stoichiometry of the  equation) Step 2: So convert 4.50 g of methane (CH 4   ) in moles  = 4.50 g CH / 16.0 g (MW of CH 4 ) = 0.28125  moles.
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