assignment- Energy#2

assignment- Energy#2 - Assignment#2 on Energy...

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Unformatted text preview: Assignment #2 on Energy: Calorimetry & Thermochemistry 1. (a) A simple calorimeter containing 500 mL of water was calibrated by passing a current of 6.00 A through the instrument for 45.0 seconds at a potential difference of 4.00 V. This procedure resulted in a temperature rise of 0.443 o C. Calculate the calibration factor for the calorimeter and its contents. (b) Given that the specific heat capacity of water is 4.18 J o C- 1 g- 1 , explain why the calibration factor must be greater than 2090 J o C- 1 . (c) When 5.40 g of solid calcium oxide is added to the calorimeter, it reacts with the water as shown by the equation CaO (s) + H 2 O (l) → Ca 2+ (aq) + 2 OH- (aq) If the temperature is observed to rise by 2.60 o C, calculate the ΔH value for the above reaction. Show all working. 2. (a) A research worker used a bomb calorimeter to determine the energy content of a brand of milk. A 10.0 mL sample of the milk was carefully dried and the remaining solids were ignited in a bomb calorimeter in an atmosphere of pure oxygen. The temperature of the water bath in which the ‘bomb’ calorimeter in an atmosphere of pure oxygen....
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assignment- Energy#2 - Assignment#2 on Energy...

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