Chemistry calorimetry lab sheet

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timer Asked: Mar 9th, 2015

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Calorimetry Lab Sheet.odt

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In this lab activity, you are asked to use data from a calorimeter to calculate changes in enthalpy. Use 4.18 J/ (g °C) for the specific heat of water. Answer the questions using the data provided 1. You place 3.52 g of sodium hydroxide to dissolve in a calorimeter cup. The cup contains 1,000.0 mL of water at 20.00°C (in a calorimeter cup). As the sodium hydroxide dissolves, the temperature of the surrounding water increases to 23.70°C. Complete the table below and determine the total energy released. Use the formula q =m ´C ´VT . Mass of Water (g) Heat Capacity of Water (J/(g °C)) Change in Temperature (°C) Total Energy Released (J) Using the calculation in the previous table and the total amount of sodium hydroxide, determine the change in enthalpy of the solution in J/g of sodium hydroxide. _____________ ________ 2. A nutritionist burns 28.0 grams of corn chips. The heat released raises 5,000.0 mL of water from 22.0°C to 54.0°C. Complete the table below, assuming the corn chips are completely burned and all the heat is absorbed by the water. Complete the table for 61.0 g of tomatoes if the same setup is used and the temperature increases by 4.00°C. Food Item Mass of Water (g) Heat Capacity of Water (J/(g °C)) Change in Temperature (°C) Total Energy Released (J) corn chips tomatoes How much heat (in Joules/g) is released by the combustion of the following: corn chips ________ tomatoes ________ When you discuss calories in food, you are talking about kilocalories (Kcal), which is the amount of heat necessary to raise 1,000.0 mL of water by 1 degree Celsius, which is approximately4.18kJ. Compare the number of kilocalories in one gram of tomatoes to the number of kilocalories in one gram of corn chips.
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