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# Need help calculating the heat released into solution for the 3 reations The Enthalpy Change of a Chemical Reaction Experiment 1 The Enthalpy Change

Need help calculating the heat released into solution for the 3 reations

The Enthalpy Change of a Chemical Reaction
Experiment 1

The Enthalpy Change of a Chemical Reaction1.  Record the following for each of the three trials:

·  Trial 1

 a Mass of the empty calorimeter (g) 18.6g b Initial temperature of the calorimeter (°C) 21.5°C c Maximum temperature in the calorimeter from the reaction (°C) 35.0°C d Calculate ΔT by subtracting (b) from (c) (°C) ΔT = Tmaximum - Tinitial 35.0°C-21.5°C=13.5°C e Mass of the calorimeter and its contents after the reaction (g) 68.74g f Calculate the mass of the contents of the calorimeter (g) by subtracting (a) from (e) 68.74g-18.6g=50.14g g Calculate the moles of Mg reacted (MW = 24.305 g/mole) ? 50mL of 1M HCI is 50/1000x1=0.05 .15/24.305=.006g/mole

·  Trial 2

 a Mass of the empty calorimeter (g) 18.6g b Initial temperature of the calorimeter (°C) 21.5°C c Maximum temperature in the calorimeter from the reaction (°C) 44.0°C d Calculate ΔT by subtracting (b) from (c) (°C) ΔT = Tmaximum - Tinitial 44.0°C-21.5°C=22.5°C e Mass of the calorimeter and its contents after the reaction (g) 68.83g f Calculate the mass of the contents of the calorimeter (g) by subtracting (a) from (e) 68.83-18.6=50.23 g Calculate the moles of Mg reacted (MW = 24.305 g/mole) .25/24.305=.010g/mole

·  Trial 3

 a Mass of the empty calorimeter (g) 18.6g b Initial temperature of the calorimeter (°C) 21.5°C c Maximum temperature in the calorimeter from the reaction (°C) 52.9°C d Calculate ΔT by subtracting (b) from (c) (°C) ΔT = Tmaximum - Tinitial 52.9°C-21.5°C=31.4°C e Mass of the calorimeter and its contents after the reaction (g) 68.92g f Calculate the mass of the contents of the calorimeter (g) by subtracting (a) from (e) 68.92g-18.6g=50.32 g Calculate the moles of Mg reacted (MW = 24.305 g/mole) .35/24.305=.014g/mole

2.  Calculate the heat released into the solution for the 3 reactions, according to the formula:

 qreaction= (Ccal * ΔT) + (mcontents* Cpcontents* ΔT)

1) Since the Ccal is not mentioned I will assume it to be zero Qreaction = m x Cp x dT ; Cp for water based systems is 4.18... View the full answer

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