Last modified: Fri 11/01/2013 10:18:26 am

Oklahoma State University

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.

Do not press the RETURN or ENTER key while you are answering these questions. Your browser will interpret either the same as clicking on the Submit key.

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.

First Name:

Last Name:


1. 50.0 mL of 1.0 M HNO3 solution and 50.0 mL of 1.0 M NH3 solution are placed in a coffee cup calorimeter having a heat capacity of 30.3 J °C-1. The density of each solution is 1.00 g mL-1 and the specific heat of the solution is 4.20 J g-1 °C-1 . The initial temperature of both solution is 23.7 ° and the final temperature of the mixture in the calorimeter was 24.8 °.

a) Is the reaction exothermic or endothermic?


b) What produces the heat in the question?

c) How much heat is absorbed by the solution?


d) How much heat is absorbed by the calorimeter?


e) Determine the the total heat released in the reaction between nitric acid and ammonia?


f) How much heat is released per mole of ammonium nitrate formed? Joules mol-1


g) Write the chemical equation to describe the reaction

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

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