# thermochemistry and hess's law

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a) When solutions of two reactants were mixed in a Styrofoam calorimeter, the temperatures in the table below were recorded as a function of time.Perform the following steps in order to determine the final temperature, from your data.

a) When solutions of two reactants were mixed in a Styrofoam calorimeter, the temperatures in the table below were recorded as a function of time. Perform the following steps in order to determine the final temperature, 𝑇𝑓 from your data. i. Plot by hand the data shown below on one of the available pieces of graph paper. Plot time on the x-axis, and temperature on the y-axis. ii. Determine the point where the solution begins to cool iii. Using this point and all of the points afterwards, draw a straight line as a bestfit line. iv. Extend the line back to the y-axis to find 𝑇𝑓 . The initial temperature (𝑇𝑖 ) was 24.3 °𝐶, make sure to include this data in your graph. Make sure to label your axes and put a title on your graph. Time (𝒔) 0 30 60 90 120 𝑻 (°𝑪) 24.3 38.6 39.7 39.5 39.4 b) What is the value of 𝛥𝑇 for the above example? Time (𝒔) 150 180 210 240 𝑻 (°𝑪) 39.3 39.2 39.1 39.0

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