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What is the standard enthalpy change (ΔH°) for the reaction: C(s) + O2(g) → CO2(

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Question: What is the standard enthalpy change (ΔH°) for the reaction: C(s) + O2(g) → CO2(g)? (2022)

Options:

  1. It is always positive.
  2. It is always negative.
  3. It can be zero.
  4. It depends on the temperature.

Correct Answer: It is always negative.

Exam Year: 2022

Solution: 

The standard enthalpy change for combustion reactions, such as the formation of CO2 from carbon and oxygen, is typically negative, indicating that the reaction is exothermic.

What is the standard enthalpy change (ΔH°) for the reaction: C(s) + O2(g) → CO2(

Practice Questions

Q1
What is the standard enthalpy change (ΔH°) for the reaction: C(s) + O2(g) → CO2(g)? (2022)
  1. It is always positive.
  2. It is always negative.
  3. It can be zero.
  4. It depends on the temperature.

Questions & Step-by-Step Solutions

What is the standard enthalpy change (ΔH°) for the reaction: C(s) + O2(g) → CO2(g)? (2022)
  • Step 1: Understand that the reaction involves carbon (C) and oxygen (O2) combining to form carbon dioxide (CO2).
  • Step 2: Recognize that this is a combustion reaction, where a substance (carbon) reacts with oxygen.
  • Step 3: Know that combustion reactions usually release energy, making them exothermic.
  • Step 4: Remember that the standard enthalpy change (ΔH°) for exothermic reactions is negative.
  • Step 5: Conclude that the standard enthalpy change (ΔH°) for the reaction C(s) + O2(g) → CO2(g) is negative.
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