The Department of Chemistry, TAMUK General Chemistry Exam 9 Your favorite candy
ID: 500676 • Letter: T
Question
The Department of Chemistry, TAMUK General Chemistry Exam 9 Your favorite candy bar, Gummy Beakers, contains 12 Jofeneray while your favorite soft drink, Bolt, contains 67 If you eat two packs of Gummy Beakers a day and drink 3 cans of Bolt, what percent of your 2000 Calorie daily food intake is lef f broccoli,beans,beef enc? 20. 15.0g of ice cubes at 00 Care combined with 150.gofliquid water at 700 C in a coffee cup calorimeter. Calculate the final temperature hed assuming no heat loss or gain from the surroundings. Data: specific heat capacity ofHoNN. 4.18 Jig C AI-602 kJ molExplanation / Answer
17) The system is the part of the universe we wish to focus our attention on. In the world of chemistry, the system is the chemical reaction. Eg 2H2 + O2 ---> 2H2O The system consists of those molecules which are reacting.
The surroundings are everything else; the rest of the universe. For example, say the above reaction is happening in gas phase; then the walls of the container are part of the surroundings.
18) 268.95 kcal = 4.18 * 268.95 =1125.2868 KJ
The final product is water vapor. Molar mass formed is 1125.28 KJ / 40.01 Kj/mol = 28.125 moles fromed and total mass of water formed is 28.125/18 = 1.5625 kg
13) C6H12O6 + 6O2 = 6CO2 + 6H2O + 2803 kj/mole of glucose
for one mole of glucose needs O2 of 6 moles * 32 gram/mol = 192 grams but it only used 96 grams which is half so energy released would be 2803/2 = 1401.5 kj = 1401.5/ 4.18 = 334.966539 kcal
15) A state function is a property whose value does not depend on the path taken to reach final value.
Example : T, P, Entropy, Enthalpy
16) From First law of Thermodynamics dE = dQ + dW
Work done = 0 => dE = dQ sign is positive
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