1. On Exam 1, you were asked to consider the film The Martion, in which a chemis
ID: 1043801 • Letter: 1
Question
1. On Exam 1, you were asked to consider the film The Martion, in which a chemist harnesses energy associated with the reaction between table sugar and liquid oxygen, shown in the balanced reaction below. Let's do it again vel 02-2aoml b (2 points) Calculate the heat gpiven off by this reaction when performed with mass- (densih()2000mt liquid onygen id 1.141) and 200.0 grams of sugar (0423 /mol) i. -2353 2685 3012 ? 22 23 32,220 N. -3064 W . -32,220 imol sug 229.2 324/mol (3points) The reaction in part b occurs in a carnster, originally at 200 °C What is final temperature in the cannister after the reaction (assume that by now, it contains only 1158g water and 308.6g carbon dioxide)2 Hint: first, solve for change in temperature c. s012 K3 3 (613.111) 3012'10,-4474.113? 4473 173 20 4493.17t According to your professor's estimates while watching the scene on Youube. Alvo assurme that, unlike in the im, the cannister has not exploded. Tet. t. (1 point) OK, finel Let's say the cannister does, indeed, explode, going from volume of 1.001 to 270 10-L, against an external pressure of ESO × 10-7 atm. Calculete the work of the reaction, n Joules (1 point) Consider your answers for heat and work in parts b and 1. What is the total energy of this reaction?Explanation / Answer
ANSWER
Qf:
The work of expansion = Pext X ?V ; ?V = change in volume = 2.7 X 106L -1 = 2.7 X 106L
The work of expansion = 8.5 X 10-7 atm X 2.7 X 106L = 2.3 Latm = 2.3 X 101.33 = 232.55J
Qg: Total energy of the reaction = heat + work = -3012000J + 232.55J = 3011.76KJ
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