CHEM1030 Final Fall 2001
December 14, 2001

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Name

Information you may need:

Heats of Formation:

H2S(g) -20.17 kJ/mol
SO2(g) -296.9 kJ/mol
H2O(l) -285.83 kJ/mol

1. Write the quantum numbers for the p-electrons in the C atom.(8 pts)

2. A sample of a compound that contains only C, H, and S was burned in oxygen and 9.682 g of CO2, 4.956 g of H2O, and 3.523 g of SO2 were obtained. What is the empirical formula of the compound? (12 pts)

3. Predict the intermolecuar forces operating in the following:(12 pts)

(a) liquid SO2

(b) solid NaCl

(d) liquid CH3CH2OH

4. Using the table of average bond energies, calculate the «H for the reaction and indicate if the reaction is exothermic or endothermic.(12 pts)
CH3OH(g) ----> CO(g) + 2H2(g)

Bond : C-0 C=O C=O C-H H-H O-H
BE(kJ/mol) 358 799 1072 413 436 463

5. Predict the electron pair shapes, the molecular shapes, and the hybridization of the central atoms in the following:(12 pts)

(a) XeOF3+1 (b) BrF4-1

6. Write the electronic configurations for:(12 pts)

(a) Cu

(b) Pd+2

7. Name the following compounds:(9 pts)

(a) K2Cr2O7

(b) NH4HCO3

8. For the molecule, F2CCO, using formal charge write the best Lewis Dot structure. Give the hybridization of each atom and tell what orbitals are used to form each bond and what orbitals are used for any
lone pairs.(16 pts)

9. A sample of P4O10 contains 5.2 X 1021 phosphorus atoms. Calculate the mass of the sample.(10 pts)

10. Predict the following properties and give the reason for your choice:(27 pts)

(a) The highest ionization energy, Na, Mg or Al?

(b) The most exothermic electron affinity(the highest affinity), B, C or N?

(d) The greatest lattice energy, MgO, NaF or Al2O3?

(e) The most polar bond, NH, NO or NF?

(f) Greater boiling point, HF, NH3, or H2O?

(g) The greatest surface tension, CH3CH2CH3, CH3OCH3 or CH3CH2OH?

(h) The nearest neighbors in a body centered cubic structure, a simple cube or a face centered cube?

(I) The HNH bond angle in NH4+1 or NH3?

11. Using the standard enthalpies of formation on the front of your test, calculate the «Ho for the following reaction:(10 pts)

2H2S(g) + 3O2(g) -----> 2H2O(l) + 2SO2(g)

12. What is the molarity of a solution of Ba(OH)2 if 25.00 mL of this solution requires 15.27 mL of a 0.1000 M solution of HCl for complete neutralization?(10 pts)

13. In a coffee cup calorimeter, 50.0 mL of 0.100M AgNO3 and 50.0 mL of 0.100 M Hcl are mixed to yield the following reaction:
Ag+1(aq) + Cl-1(aq) ----> AgCl(s)
The two solutions were initially at 22.60oC and the final temperature is 23.40oC. Calculate the heat that accompanies this reaction in kJ/mol of AgCl formed. Assume the combined solution has a mass of 100.0 g and a specific heat capacity of 4.18j/goC. (12 pts)

14. Write the net ionic equations for the following reactions. If no reaction occurs write NR. All reactions occur in aqueous solution.(9 pts)

(a) ammonium acetate + lithium bromide

(b) Na2S + NiI2

15. Calculate the molecular weight of a gas in a container if the gas exerts a pressure of 740 torr at a temperature of 15oC and has a density of 0.717 g/L. (12 pts)

16. A 500. mL sample of a gas was collected over water at 30.oC and a barometric pressure of 1.010 atm. What volume would the gas occupy if dry and at 100.oC and a pressure of 1.000 atm? ( Vapor pressure of H2O at 30oC is 0.0419 atm). (10 pts)

17. What is the maximum number of grams of OF2(g) that can be prepared from 2.50 g of F2(g) and 2.50 g of NaOH(s)? The equation for the reaction is:(12 pts)

2F2(g) + 2NaOH(aq) ----> OF2(g) + 2NaF(aq) + H2O(l)