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Skill 3: Analysing; Enthalpy of Decomposition of Sodium Hydrogencarbonate Procedures and results Sodium Carbonate experiments Chemical Mass of Cup (grams) Mass of solid + cup (grams) Mass of solid (grams) Na2CO3 1.041 3.541 2.500 Na2CO3 1.114 3.514 2.500 Na2CO3 0.935 3.435 2.500 Table of results Time Experiment 1 Experiment 2 Experiment 3 Temp. of solid (0C) Temp. of solution (0C) Temp. of solid (0C) Temp. of solution (0C) Temp. of solid (0C) Temp. of solution (0C) 0 21.2 21.0 21.2 20.0 21.2 20.0 1 - 21.0 - 20.0 - 20.0 2 - 21.0 - 20.0 - 20.0 3 - 21.0 - 20.0 - 20.0 4 - - - - - - 5 - 25.5 - 25.0 - 25.0 6 - 25.0 - 24.4 - 24.0 7 - 24.8 - 24.2 - 24.0 8 - 24.6 - 24.0 - 23.8 9 - 24.5 - 24.0 - 23.8 10 - 24.5 - 23.9 - 23.6 Analysis Mr. of Sodium Carbonate = 2 x Ar (Sodium) + Ar (Carbon) + 3xAr (Oxygen) = 2 x 23.0 + 12.0 + 3 x 16.0 = 106 Moles of sodium carbonate used = mass of solid used Mr = 2.500/106 = 0.0235 mol Mass of acid = volume x density = 30.00 x 1 = 30.0 grams Mass of Solution = mass of acid + mass of solid = 30.0 + 2.500 = 32.5 grams The same amount of acid and solution was used throughout the 3 experiments Experiment 1 (T = T2 - T1 = 25.61 - 21.0 = 4.6 0C Energy transferred to surrounding = m x c x (T = 32.5 x 4.2 x 4.6 = 627.9 Joules Internal energy change = - 627.9...

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