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Answers – Problem 82 Combustion of Stearic Acid

Problem 6.82 (a): Write a balanced equation for the complete combustion of stearic acid (C 18 H 36 O 2 ) to gaseous products. (b) Calculate Δ H o rxn for this combustion ( Δ H o f of C 18 H 36 O 2 is -948 kJ/mol)

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Answers – Problem 82 Combustion of Stearic Acid

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  1. Problem 6.82 (a): Write a balanced equation for the complete combustion of stearic acid (C18H36O2) to gaseous products. (b) Calculate ΔHorxn for this combustion (ΔHof of C18H36O2 is -948 kJ/mol) (c) Calculate the heat (q) in kJ when 1.00 g of stearic acid is burned completely.

  2. Answers – Problem 82Combustion of Stearic Acid (a) Calculate ΔHorxn for diluting 1.00 mol of H2SO4 (l) to 1 L of 1.00 M H2SO4 (aq). (b) Suppose you carry out the dilution in a calorimeter. The initial T is 25.0oC, and the specific heat capacity of the final solution is 3.50 J/g·K. What is the final T?

  3. Problem 6.83: Care must be taken when diluting sulfuric acid with water, because the dilution process is highly exothermic: • Note: H2SO4 (l) ΔHof = -813.99 kj/mol, d=1.83 g/mL • H2SO4 (aq) ΔHof = -907.51 kj/mol, d=1.06 g/mL • Calculate ΔHorxn for diluting 1.00 mol of H2SO4 (l) to 1 L of 1.00 M H2SO4 (aq). • (b) Suppose you carry out the dilution in a calorimeter. The initial T is 25.0oC, and the specific heat capacity of the final solution is 3.50 J/g·K. What is the final T?

  4. Answers – Problem 83Dilution of Sulfuric Acid • Calculate ΔHorxn for diluting 1.00 mol of H2SO4 (l) to 1 L of 1.00M H2SO4 (aq). • (b) Suppose you carry out the dilution in a calorimeter. The initial T is 25.0oC, and the specific heat capacity of the final solution is 3.50 J/g·K. What is the final T?

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