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Question 2: Answer the following questions and show your work in details. (8 points) a. For the transition of an electron from n = 6 to n = 2 in hydrogen atom, Calculate the wavelength (in nm) of the photon associated with this transition. (c= 3.0x10* m/s, h = 6.626 x 10-34 J.s, Rn = 2.18x10" *J). (4 points) b. Choose the correct answer and transfer them in the table below. (4 points) 1. Which has the highest ionization energy? A) Na B) K C) Li D) Cs 2. What is the electronic configuration of 24Cr? A) [Ar] 4s- 3d* B) [Ar] 3d+ C) [Ar] 4s' 3d5 D) none of them 3. What is true about the angular momentum quantum number (/): A) Shape B) Energy/size C) Orientation D) +1/2 or -1/2 4. The electron configuration of the outer shell for chromium 29Cu is? A) 4s2 3d+ B) 4s2 4p C) 4s 3d10 D) 4s' 3ds 5. The maximum number of electrons that can d orbital holds is: A) 2 B) 6 C) 10 D) 14 6. For / = 2, what are the values of my? A) 0, 1, 2 B) -1, 0, 1 C) -2, -1, 0, 1, 2 D) none of them 7. Maximum of two electrons per orbital. (Pauli Exclusion Principle) A) True B) False 8. Electrons do not pair in degenerate orbitals if an empty orbital is available. (Hund's Rule) A) True B) False Transfer your correct answers in the following table: Question 2 3 5 6 7 8 Answer

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a. For an ideal gas, calculate the volume of 3.2 mol Oz at STP. (1 point) b. What is the name of a device used to measure atmospheric pressure? (1 point) c. Diethyl ether (C2Hs)20 vaporizes at room temperature. If the vapor exerts a pressure of 0.3 atm in a flask at 25 "C, what is the density of the vapor? (2 points) d. The vapor pressure of water at 35 "C is 63.8 atm and the vapor pressure of methanol, CH3OH, is 3.5 atm at the same temperature. What is the total pressure of a solution at 35 "C composed of 6.0 g of water and 4.0 g of ethanol? The molar mass of water is 18 g/mol and molar mass of methanol is 32.04 g/mol (3 points) (Hint: PTotal = % water Powater + % ethanol P"methanol ).

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Question 3: Answer the following questions and show your work in details. (8 points) a. Given the following information: (3 points) CH4 + 2 02 - CO2 + 2 H20 AH = -891 kJ CH4 + 3 02 - 2 CO2 + 2 H20 AH =-1411 kJ 2H2 + 02 - 2 H20 AH =-571 kJ Calculate the AH for the reaction: 2 CH4 - 2 H2 + CH4 AH = ? b. Consider the combustion of propane: Calsg)+ 502g)-+3CO2g)+4H20m, AH =-2221 kJ Assume that all of the heat comes from the combustion of propane. Calculate AH in which 15.00 g of propane is burned in excess oxygen at constant pressure. (2 points) C. Propane (C;Hg) burns in air to produce carbon dioxide and liquid water. How much heat is released per mole of Propane combusted? (3 points) C3Hs + 5 02 * 3CO2 + 4 H20 Use the following values in the table for the standard enthalpy of formation: AH'f (k.J/mol) AHr" (CO2) 393.5 AHr" (H20) -285.8 AHr" (02) 0.0 AHr" (C3Hs) -101.6

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Question 4: Choose the correct answer and transfer them in the table below. (5 points) 1. How many valence electrons are expected for an element that is in group 4A of the periodic table? A) 1 B) 2 C) 3 D) 4 2. Which of the following atoms is the highest electronegative? A) F B)O C) N D) Be 3. Which of the following combinations of two elements is most likely to produce polar covalent bonds? A) N and O B) N and N C) Na and N D) Li and F 4. Which carbon to carbon bond is the shortest? A) C-C B) C=C C) C=C D) All bonds are equal in length. 5. Which of the following pairs of elements are likely to form Ionic bond? A) Cl and Cl B) K and O C) H and O D) N and N 6. Which carbon to carbon bond is the weakest? A)C-C B) C=C C) CEC D) All bonds are equal in strength. 7. The valence electrons are the electrons that participate in chemical bonding. A) True B) False 8. Which of the following elements is the least electronegative? A)O B) H C) P D) Sr 9. Polar bond is a covalent bond with greater electron density around one of the two atoms A) True B) False 10. Which one of the following bonds is non-polar? A)C-C B) Br-Br C) X-X D) All bonds are non-polar. Transfer your correct answers in the following table: Question 5 8 9 10 Answer

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Question 5: Answer the following questions (5 points) a. The second-order diffraction (n = 3) for a gold crystal is at an angle of O= 20" for X rays wavelength (2= 105 pm). Calculate the spacing (d) between these crystal planes? (2 points) b. Based on molar mass and dipole moment of the five compounds in the table below, which compound has the highest boiling point ? (1 point) Compound Molar Mass (g/mol) dipole moment (D) CH3CH2CH3 44 0.1 CH3OCH3 46 1.3 CH3CI 50 1.9 CH3CHO 44 2.7 CH3CN 41 3.9 c. What type(s) of intermolecular forces exist between each of the following molecules? (2 points) 1. CH4 : 2. HCI : 3. CH3CH3 : 4. CH3OH :

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Question 6: Answer the following questions (7 points) a. Mark the compound which is not soluble in water? (1 point) H-C CH.H CH3 H CH3 H H-O H -O-H H,C H H HC- H H CH3 H- O-H H2 (A) (B) b. A solution is made by dissolving 20.5 g of glucose (CH1206) (molar mass is 180 g/mol) in 150 g of water. What is the molality this solution? (2 points) c. A 5.5 g sample of groundwater was found to contain 7.4 ug of Zn?. What is the concentration of Zn in parts per billion? (2 points) d. An antifreeze solution has a molality of 2.41 m. Calculate the freezing point of the solution. Krof water is 1.86 C/m. The normal freezing point is 0.0 "C. (2 points)

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I want the answer key for this general chemistry final exam course code chm101 

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