CHM 101L M4 Fundamentals of Calorimetry Lab Report

2 1. Create a spreadsheet and graph of the data from Data Table 1, plotting temperature vs. time, and use the Y intercept to find the temperature at time 0 when the two volumes of water are mixed. a. Insert graph below. 0 2 4 6 8 10 12 0 10 20 30 40 50 f(x) = − 0.63 x + 45.07 f(x) = − 0.76 x + 43.27 Activity 1 Chart Water Temperature vs Time Trial 1 Temp(°C) Linear (Trial 1 Temp(°C)) Trial 2 Temp. (°C) Linear (Trial 2 Temp. (°C)) Time (min) Temperature (Celsius) Activities 2 and 3 Data Table 2 5g CaCl 2 10g CaCl 2 15g CaCl 2 5g NH 4 Cl 10g NH 4 Cl 15g NH 4 Cl Mass of water (g) 100g 100g 100g 100g 100g 100g Mass of salt (g) 5g 10g 15g 5g 10g 15g Moles of salt (g x mol/g) 0.045m 0.090m 0.135m 0.093m 0.187m 0.280m Initial Temperature (°C) T i 17 °C 17 °C 17 °C 17 °C 17 °C 17 °C Final Temperature (°C) T f 23 °C 30 °C 36 °C 13 °C 9 °C 6 °C Change in Temperature (°C) ∆T = T f - T i 6 °C 13 °C 19 °C -4 °C -8 °C -11 °C Heat absorbed by the solution (J) q w = -[c w x m w x -2636J -5983J -9142J 1757J 3681J 5293J © 2016 Carolina Biological Supply Company