Butane, the chemical in disposable lighters, is produced by cracking and distill
ID: 1059040 • Letter: B
Question
Butane, the chemical in disposable lighters, is produced by cracking and distilling crude oil. acid, the sour flavor in vinegar, is produced by reacting butane and oxygen in the pressure of special catalyst. This reaction is shown below. Calculate the reaction enthalpy for this reaction using the bond enthalpy table at the rear of the quiz or in Chapter 8 Section 8.8 of your textbook if you are practicing this problem at home. a) -1857 kJ b) -3714 kJ c) -929 kJ d) 3714 kJ e) 1857 kJ What is the energy output of a light source in J/s (joules per second) If it produces 711 photons per second, and these photons have a wavelength of 455 nm? c = 2.998 times 10^8 m/s. h = 6.63 times 10^-34 3-s. a) The energy output is 4.37 e-19 J/s. b) The energy output is 3.11e-16 J/s. c) The energy output is 1.63e + 21 J/s. d) The energy output is 6.14 e-22 J/s. e) The energy output is 2.14 e -37J/sExplanation / Answer
11 )
Bond - enthalpies required,
C-C ------> 348 kJ/mol
C-H -------> 413 kJ/mol
O=O -------> 495 kJ/mol
C=O -------> 799 kJ/mol
O-H --------> 463 kJ/mol
C-O --------> 358 kJ/mol
For butane , 2 [10(C-H) + 3(C-C) ] =2 [ 10*413 + 3*348 ] = 10348 kJ/mol
For O=O , 5*495 kJ/mol = 2475 kJ/mol
For acetic acid , 4 [ 3(C-H) + (C-C) + (C=O) + (C-O) + (O-H) ] = 12828 kJ/mol
For water, 2 [ 2 ( O-H) ] = 1852 kJ/mol
Enthalpy = [ (10348 + 2475) - (12828 + 1852) ] = -1857 kJ/mol Option a) is the answer
12) = c / = 2.988 *108 m/sec / 455 *10-9m = 6.567032*1014 sec-1
E = n * h = 711 * 6.626 *10-34J * 6.567032*1014 sec-1 = 3.0937 *10-16 J/sec
Option b) is the answer
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