Chem Lab 5 - Chem 111 Lab 14 November 2011 Hesss Law Formal Write Up A Research Question How do you determine the heat gained in a reaction B

# Chem Lab 5 - Chem 111 Lab 14 November 2011 Hesss Law Formal...

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Chem 111 Lab 14 November 2011 Hess’s Law Formal Write Up A. Research Question: How do you determine the heat gained in a reaction? B. Theoretical Approach: To find the heat gained in a reaction, you must start 3.5g of NaOH. From there you will set up a cup of 100.0 ml of water which you will take the beginning temperature of and the final temperature, after you add the NaOH. To find the total mass in this reaction you will add your amount of grams to 1.000g for the added water. Next, you will want to find the change in temperature. To do this you take the final temperature and subtract the initial temperature. To find the heat gained you will use the equation q solution = C sp x mass x temp (C sp is given to be 4.184 J/g C). At this point you have found all the components that are needed for the equation, now you can calculate the heat gained in the reaction. Table: Overall data collected from 3 reactions to find Hess’ Law, H Reaction1 Reaction 2 Reaction 3 Mass of solid NaOH 3.46 g (no solid NaOH) 1.676 g Total mass of solution 4.46 g