W_06+-+practice+exam+2 - 1 The E of a system that releases...

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1) The E of a system that releases 12.4 J of heat and does 4.2 J of work on the surroundings is J. A) 16.6 B) 12.4 C) 4.2 D) –16.6 E) –8.2 2) Which of the following is a statement of the first law of thermodynamics? 1 mv E k = 3) The reaction ) ( 2 ) ( 3 ) ( 4 3 2 2 s O Al g O s Al + kJ H 3351 = ° is , and therefore heat is by the reaction. A) endothermic, released B) endothermic, absorbed C) exothermic, released D) exothermic, absorbed E) thermoneutral, neither released nor absorbed 4) The value of H ˚ for the reaction below is –1107 kJ: ) ( 2 ) ( ) ( 2 2 s BaO g O s Ba + How many kJ of heat are released when 15.75 g of Ba(s) (A.W. = 137.3 g/mol) reacts completely with oxygen to form BaO(s)? A) 20.8 B) 63.5 C) 114 D) 70.3 E) 35.1
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5) A sample of aluminum metal absorbs 9.86 J of heat, upon which the temperature of the sample increases from 23.2 ˚ C to 30.5 ˚ C. Since the specific heat capacity of aluminum is 0.90 J/(g K), the mass of the sample is g. A) 72 B) 1.5 C) 65 D) 8.1 E) 6.6 6) The value of H ˚ for the reaction below is –186 kJ.
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