Chapter 5 Sample Problems

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:
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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• Spring '08
• Cook
• Basic Chemistry, 16.0 g, 34 g, 140 J, 85 J, 196 kJ, 55 j

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