[SANGAT MUDAH] Cara menghitung kalor reaksi pada kalorimeter (PART 2)

Rumah Belajar MattPlus
29 Sept 202007:32

Summary

TLDRIn this educational video, the host discusses how to calculate the enthalpy of combustion using a calorimeter. The first problem involves the combustion of 8 grams of methane, resulting in a temperature rise from 25.5°C to 95°C in a 4-liter water calorimeter. Using the heat capacity of water and assuming the calorimeter's capacity is zero, the enthalpy of combustion is calculated to be -2184 kJ/mol. The second problem examines a reaction between nickel and CuSO4 solution, causing a 5°C temperature increase. The reaction's enthalpy is determined to be -4000 kJ/mol under standard conditions, showcasing the application of thermodynamics in chemical reactions.

Takeaways

  • 🔍 The video discusses how to calculate the enthalpy change using a calorimeter.
  • 🔥 The first problem involves the combustion of 8 grams of methane, resulting in a temperature rise in the calorimeter.
  • 🌡️ The calorimeter's temperature increases from 25.5°C to 95°C due to the reaction.
  • 💧 The calorimeter contains 4 liters of water, and the specific heat capacity of water is given as 4.2 J/g°C.
  • ⚖️ The mass of the water in the calorimeter is calculated to be 4000 grams, assuming 1 liter is equivalent to 1 kilogram.
  • 🔢 The change in temperature (ΔT) is calculated as the difference between the final and initial temperatures.
  • 🔄 The enthalpy change of the reaction is calculated using the formula: \( \Delta H_{reaction} = -(mass_{water} \times c_{water} \times \Delta T) \).
  • 🌐 The calorimeter's heat capacity is considered zero, simplifying the calculation.
  • 🔄 The moles of methane burned are calculated by dividing the mass by the molar mass.
  • 🔍 The final enthalpy change per mole of methane is determined by dividing the total enthalpy change by the moles of methane.
  • 🧪 The second problem involves a reaction between nickel and a CuSO4 solution, causing a 5°C temperature increase in the solution.

Q & A

  • What is the mass of methane (CH4) burned in the first problem?

    -The mass of methane (CH4) burned is 8 grams.

  • What is the initial and final temperature of the calorimeter in the first problem?

    -The initial temperature is 25.5 degrees Celsius, and the final temperature is 95 degrees Celsius.

  • How much heat capacity does the calorimeter have in the first problem?

    -The calorimeter is assumed to have a heat capacity of zero.

  • What is the heat capacity of water in the first problem?

    -The heat capacity of water is 4.2 Joules per gram-degree Celsius.

  • How much heat is absorbed by the water in the first problem?

    -The water absorbs 1092 kilojoules of heat.

  • What is the molar mass of methane (CH4) used in the first problem?

    -The molar mass of methane (CH4) is 16 grams per mole.

  • What is the amount of methane (CH4) burned in moles in the first problem?

    -Half a mole of methane (CH4) is burned.

  • What is the enthalpy change for the combustion of methane in kilojoules per mole in the first problem?

    -The enthalpy change for the combustion of methane is -2184 kilojoules per mole.

  • What is the mass of nickel metal reacted with CuSO4 solution in the second problem?

    -The mass of nickel metal reacted is 2.95 grams.

  • How much temperature increase is caused by the reaction of nickel metal with CuSO4 solution in the second problem?

    -The reaction causes a 5-degree Celsius increase in the temperature of the solution.

  • What is the heat required to raise the temperature of the solution by 1 degree Celsius in the second problem?

    -It requires 4 kilojoules of heat to raise the temperature of the solution by 1 degree Celsius.

  • What is the molar mass of nickel used in the second problem?

    -The molar mass of nickel is 59 grams per mole.

  • How many moles of nickel are reacted in the second problem?

    -0.05 moles of nickel are reacted.

  • What is the enthalpy change for the reaction of nickel with CuSO4 solution in kilojoules per mole in the second problem?

    -The enthalpy change for the reaction is -40000 kilojoules per mole.

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Étiquettes Connexes
Enthalpy CalculationCalorimeterChemical ReactionsEducational VideoScience TutorialThermal EnergyHeat TransferChemistry BasicsLearning ResourceScience Education
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