ACA

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

It is OK to use your textbook or lecture notes from class, but if you can answers the questions without it that is OK too.

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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. Calculate H^o_rxn for the following reaction (note you will need a table of standard enthalpies of formation.) You might also print out the answers to the Enthalpy DCI to help with these calculations.

a) 3NO₂(g) + H₂O(l) ----> 2HNO₃(aq) + NO(g) kJ mol^-1

b) 2Na(s) + 2H₂O(l) ----> 2NaOH(aq) + H₂(g) kJ mol^-1

c) I₂(s) ----> I₂(g) kJ mol^-1

2. Using the data from 1b above answer the following question. A 0.500 g sample of sodium metal is added to a 50.0 mL sample of water initially at 22.5 °C. Assuming no heat is lost to the container, calculate the final temperature of the mixture.

°C

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

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