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What is the enthalpy change when 4 moles of a substance release 800 J of heat?

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Question: What is the enthalpy change when 4 moles of a substance release 800 J of heat?

Options:

  1. 200 J/mol
  2. 400 J/mol
  3. 100 J/mol
  4. 300 J/mol

Correct Answer: 400 J/mol

Solution: 

ΔH = q/n = -800 J / 4 mol = -200 J/mol.

What is the enthalpy change when 4 moles of a substance release 800 J of heat?

Practice Questions

Q1
What is the enthalpy change when 4 moles of a substance release 800 J of heat?
  1. 200 J/mol
  2. 400 J/mol
  3. 100 J/mol
  4. 300 J/mol

Questions & Step-by-Step Solutions

What is the enthalpy change when 4 moles of a substance release 800 J of heat?
  • Step 1: Identify the amount of heat released, which is 800 J.
  • Step 2: Identify the number of moles of the substance, which is 4 moles.
  • Step 3: Use the formula for enthalpy change (ΔH), which is ΔH = q/n, where q is the heat and n is the number of moles.
  • Step 4: Substitute the values into the formula: ΔH = -800 J / 4 mol.
  • Step 5: Calculate the result: ΔH = -200 J/mol.
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