1. Weigh out about 2.00g of crystalline Mass of MgSO47H2O MgSO47H2O. Mass of water used (same as mL) 2. Add exactly 20.0mL of DI water to your calorimeter Initial temperature of the water 3. Record the initial temperature of the water Final Temperature of the water 4. Add the MgSO4 hydrated crystals to your calorimeter and immediately close the lid (Final - Initial) 5. Stir until the temperature stops increasing 6. Record the highest temperature reached as the final temperature Calculations for Reaction 2 1. Use to find out how many joules of energy were absorbed by a) answer in Joules the water. Remember that the specific heat of water is 4.184J/g°C. Be sure to use the mass of water for this calculation. (For water 1mL=1g) b) answer in kJ 2. Find the moles of anhydrate used a) molar mass of a. What is the molar mass of MgSO47H2O? MgSO7H2O 4 b. Convert the grams of MgSO47H2O in data table 1 into moles b) moles of MgSO47H2O used 3. Find the joules of heat absorbed in the reaction in kJ. Remember, energy Energy= lost by water is negative the energy gained by the reaction. 4. Find the for this reaction in kJ/mol. (divide kJ by moles) = 5. Is this reaction endothermic or exothermic? Conclusions: Calculate the for the goal reaction using the given reactions 1. each reaction with the enthalpy of reaction you found in the lab Reaction 1: MgSO4(s) Mg+2(aq) + SO4-2(aq) =
Mass of MgSO47H2O Mass of water used (same as mL) Initial temperature of the water Final Temperature of the water (Final - Initial) 1. Weigh out about 2.00g of crystalline MgSO47H2O. 2. Add exactly 20.0mL of DI water to your calorimeter 3. Record the initial temperature of the water 4. Add the MgSO4 hydrated crystals to your calorimeter and immediately close the lid 5. Stir until the temperature stops increasing 6. Record the highest temperature reached as the final temperature Calculations for Reaction 2 1. Use to find out how many joules of energy were absorbed by the water. Remember that the specific heat of water is 4.184J/g°C. Be sure to use the mass of water for this calculation. (For water 1mL=1g) a) answer in Joules b) answer in kJ 2. Find the moles of anhydrate used a. What is the molar mass of MgSO47H2O? b. Convert the grams of MgSO47H2O in data table 1 into moles a) molar mass of MgSO7H2O 4 b) moles of MgSO47H2O used 3. Find the joules of heat absorbed in the reaction in kJ. Remember, energy lost by water is negative the energy gained by the reaction. Energy= 4. Find the for this reaction in kJ/mol. (divide kJ by moles) = 5. Is this reaction endothermic or exothermic? Conclusions: Calculate the for the goal reaction using the given reactions 1. each reaction with the enthalpy of reaction you found in the lab Reaction 1: MgSO4(s) Mg+2(aq) + SO4-2(aq) =
Thermodynamics-HASPI-Lab-Mag-Sulfate.docx