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What is the standard molar entropy of a substance?

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Question: What is the standard molar entropy of a substance?

Options:

  1. Entropy at 0 K
  2. Entropy at 25 °C and 1 atm
  3. Entropy at boiling point
  4. Entropy at melting point

Correct Answer: Entropy at 25 °C and 1 atm

Solution: 

Standard molar entropy is defined as the entropy of 1 mole of a substance at 25 °C and 1 atm pressure.

What is the standard molar entropy of a substance?

Practice Questions

Q1
What is the standard molar entropy of a substance?
  1. Entropy at 0 K
  2. Entropy at 25 °C and 1 atm
  3. Entropy at boiling point
  4. Entropy at melting point

Questions & Step-by-Step Solutions

What is the standard molar entropy of a substance?
  • Step 1: Understand what entropy is. Entropy is a measure of disorder or randomness in a system.
  • Step 2: Know that 'molar' refers to a quantity of substance measured in moles. One mole is approximately 6.022 x 10^23 particles.
  • Step 3: Recognize that 'standard' means specific conditions. In this case, it refers to a temperature of 25 °C and a pressure of 1 atm.
  • Step 4: Combine these ideas: Standard molar entropy is the measure of disorder for 1 mole of a substance at the specified conditions.
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