Q.1 – Using the reaction below, and the enthalpy of formation values, determine the theoretical enthalpy for the reaction from the equation ∆H = ∑HfProducts - ∑HfReactamts NaHCO3(s) + HC2H3O2(aq)  Na+(aq) + C2H3O2-(aq) + H2O(l) + CO2(g)

Hf values in kJ/mol

HC2H3O2(aq) -486

NaHCO3(s) -950.8

Na+(aq) -240.1

C2H3O2-(aq) -486

H2O(l) -393.5

CO2(g) -285.8

Q.2 Compare the value (+,-) in in your lab (photo attached) with the value determined in Q.1. Does the reaction correctly match the definition of exothermic or endothermic? How does the temperature change in the water correlate to the change in the reaction?

Q.3 Compare the number in your lab vs Q.1. What was the size of the error in this experiment?

% = (. 1) − (. 1)

Q.4 What are some errors in your setup that could have caused this error? What pieces of equipment would result in a better final heat measurement? Be speci

no, the red giant is the hottest with 2.00.000.000 degrees celsius. while the white dwarf only 25,000 degrees celsius.

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.

sure im new too!

explanation: