Last modified: Wed 12/31/1969 06:00:00 pm ACA

Oklahoma State University

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Answer all of the questions below. If you do not know an answer enter CNA. However, it will help me the most if you answer each question with your best intuition/idea about what would be a reasonable answer.

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1. Write the formation chemical equation for each of the following compounds. NOTE: be sure to include phases for the reactants.

a) CaCO3(s)

b) HC2H3O2(l)

2. Using the following information calculate the H° for the reaction between gaseous ClF and F2 to yield 1 mole of liquid ClF3?

Chemical Reaction

H° (kJ mol-1)

2ClF(g) + O2(g) → Cl2O(g) + OF2(g)


2F2(g) + O2(g) → 2OF2(g)


2ClF3(l) + 2O2(g) →Cl2O(g) + 3OF2(g)


rxn = kJ mol-1

3. Calculate Horxn for the following reaction (note you will need a table of standard enthalpies of formation. Use the sheet I distibuted in class, a table from the useful information page on any of the sample Exam IIIs from previous semesters, or the table that is linked on the Database page from the main CHEM 1314 web site.)

a) 2N2H4(l) + N2O4(g) ----> 3N2(g) + 4H2O(g)

rxn = kJ mol-1

4. Is there anything about the questions that you feel you do not understand? List your concerns/questions.

5. If there is one question you would like to have answered in lecture, what would that question be?