CHEM 1050 Lecture Notes - Lecture 6: Process Function, Joule, Propyl Group

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1 Feb 2016

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You can never expect more (or less) energy from a chemical reaction by changing the method of performing the reaction (path is irrelevant). Work is not a state function, it is a path function. Energy involved in making a molecule from its elements. H f is the enthalpy change involved in making a mole of a compound from its elements. H f standard h @25 c / 1 atm. 2c + 3h2(g) + o2(g) c2h5oh(l) C6h12o6 + 6o2 6co2 + 6h2o (1 2 marks) *the ( - ) becomes irrelevant when you are taking energy * Calculate the energy (heat) you can get by burning 1. 0 g of glucose with that given by. Sucrose: c12h22o11 and its h f is 2221 kj/mol (don"t use this to solve) When given a h rxn value you can calculate h f of a product or reactant.

Related Questions

Consider the reaction below:

2NO2(g) + F2(g) â¶ 2NO2F(g)

a. Based on the information provided in the table below (all measurements are at 25 ÂºC), determine the

experimental rate law and calculate the rate constant at this temperature. You can assume ideal gas

behavior for both NO2 and F2.

Initial Pressures (atm) Experiment p(NO2); p(F2) (mol L-1 s-1)

1) .038 ; .060

2) .076 ; .060

3) .076 ; .030

Initial Rate

1 0.038 0.060 1.4 ï´ 10â 5

2 0.076 0.060 2.8 ï´ 10â 5

3 0.076 0.030 1.4 ï´ 10â 5

b. Contrasting NO2 and F2, which one of these two real gases would be closer to ideal gas assumed in part a?

Draw the Lewis structures of both to support your argument.

c. Based on the rate law determined in part a, propose a reaction mechanism comprising of two bimolecular

elementary steps. Hint: F is an intermediate in the overall reaction.

d. Which elementary process in part c is rate-determining?

e. You conduct experiment 1 from the table in part a. If your initial p(NO2) is 0.038 atm and p(F2) is kept at

constant flow of 0.060 atm, how long would it take for the pressure of NO2 to drop to 0.001 atm?

f. The collision frequency and steric factor for the rate-determining step in the overall process at 25 ÂºC are

5.9x1010 and 0.16, respectively. Calculate the activation energy (in kJ/mol) for the rate determining step.

g. If the enthalpy of reaction (i.e. standard enthalpy change for the overall process) is -100 kJ/mol, sketch the

energy profile of the two-step reaction given that i) the activation energy for the fast step in part c is 5

kJ/mol and ii) equilibrium partial pressures of all species involved in the fast step are 1.0 atm

How do you answer 11 and 12?

How do you answer 1-4?

Physical Constants R-00821 L.atm rnol. K: 1 atm = 760 Torr; h-6626 x 10". Js; c-3.00 x 10e mis Multiple Choice Question-4 points each. Circle the correct choice. 1. How many orbitals are there in the n - 3 shell? )3 b)6 )9 d) 12 e) none of the preceding choices 2. Which of the following is not a valid set of four quantum numbers to describe an electron in an atom? 3. Which pair of elements would you expect to exhibit the most similar physical and chemical properties? a) As and Se b) Na and Cl c) As and Sb d) B and Be 4) The number of unpaired electrons in the ground state of an atom of Co is.. (A) one (B) three (C) five (D) seven (E) none of the preceding choices S. Which of the following processes is exothermic? a) lonization of a sodium atom b) Formation of gaseous chlorine atoms from Cl, (g) c) Breaking apart of NaC1 (s) into ions d)Addition of an electron to a chlorine atom 6. Which of the following bonds is the most polar? a) N-O b)O-F e) B-O d)S-o e) all are equally polar At what temperature (in C) will 25.0 g of carbon dioxide (at 1,00 atm) occupy 21.5 L? 188Â°C b) 461Â°C c) -263Â°C d)-270Â°C e)113Â°C How many times more rapidly will hydrogen (H2) gas effuse through a pinhole than will deuterium (D ) gas? Deuterium is an isotope of hydrogen with a molecular mass of 4.0 g/mole. (A) V2 (B) 2 (C)2v2 (D) 4 9. Which of the following arrangements from lowest to highest in first ionization energies is correct ? 10. In which of the following compounds obeys the octet rule? 1. The bright spectral lines observed in the emission spectrum of a flame or gas discharge tube are due to a) XeF b) BF, c) Cio d) so e) none of the preceding choicees a) the absorption of light at specific wavelengths b) the formation of an excited state of atoms c) the transition of an atom from an excited state to a lower energy state d) the change from anti-parallel to parallel electron spins in an atom 2. A one-liter container is filled with one mole of hydrogen at 25 Â°C. A second one-liter container is filled with one mole f oxygen at 25 Â°C. Comparing the pressure of the hydrogen to the oxygen, the ratio will be Fro n Bond Dissociation Enthalpies: AHD (CI-CI)-243 kJrnolAMD (F-F )ä¸159 klinol; lculate the enthalpy, AH, for the chemical reaction: Cl: (g)+F: (g) 2CIF(R) )-147 kJ (b)-108 kJ (c)+171 kJ (d) +912 k AHD (CI F)-255 kJ mol ;

CHEM 1050 Lecture Notes - Lecture 6: Process Function, Joule, Propyl Group

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