11) The law of states that energy that can be neither created nor destroyed A) p
ID: 570705 • Letter: 1
Question
11) The law of states that energy that can be neither created nor destroyed A) potential energy B) thermochemistry C) the conservation of energy D) the consecration of energy E) kinetic energy 12) Which of the following signs on q and w represent a system that is doing work on the 12) surroundings, as well as gaining heat from the surroundings? ca E) None of these represent the system redferenced above. 13) Calculate the change in internal energy (AE) for a system that is giving off 25.0 kJ of heat and is 13) . (Remember that 101.3J1 changing from 12.00 L to 6.00 L in volume at 1.50 atm pressure. L'atm) A) -24.1 k B) -16.0 k] C) +25.9 kJ D) 937 k E) -25.9 k] 14) The temperature rises from 25.00 C to 29.00°C in a bomb calorimeter when 3,50 g of sucrose14) undergoes combustion in a bomb calorimeter. Calculate &Erxn; for the combustion of sucrose in kl/mol sucrose. The heat capacity of the calorimeter is 4.90 kJFC. The molar mass of sugar is 342.3 g/mol A) -1.92 x 103 kJ/mole C) 1.92 x 103 kJ/mole B) 1.23 103 J/mole D) 2.35 x 104 kJ/mole 15) An exothermic reaction has A) a negative AH, gives off heat to the surroundings, and feels warm to the touch B, a positive , absorbs heat from the surroundings, and feels cold to the touch. C) a positive AH, gives off heat to the surroundings, and feels warm to the touch D) a positive aH, absoros heat from the surroundings, and reels warm to the touchExplanation / Answer
11) the conswrvation of energy. It states that energy can neither be creates nor be destroyed but can be changed into other form.
12) q+ w-. As work is done by the system so it will be less than 0 and heat is gained so it will be more than 0
13) work = PdV = 1.5 x 6 = 9 L-atm
9 x 101.3 = 911.7 joules of work done by surrounding
Which means that surrounding is 911.7 joules less energetic
And system is 911.7 joules more energetic
As given ; -25000 joules given off as heat by system and 911.7 gained by system
So, net = -24,088 joules lost
In kilojoules = -24.1 kjoules.
15) answer is A. As in exothermic reaction heat is liberated and enthalpy change is also negative
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