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What is the standard state of a substance?

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Question: What is the standard state of a substance?

Options:

  1. The most stable form at 1 atm and 25°C
  2. Any form of the substance
  3. The gaseous form only
  4. The liquid form only

Correct Answer: The most stable form at 1 atm and 25°C

Solution: 

The standard state of a substance is defined as its most stable form at 1 atm pressure and 25°C.

What is the standard state of a substance?

Practice Questions

Q1
What is the standard state of a substance?
  1. The most stable form at 1 atm and 25°C
  2. Any form of the substance
  3. The gaseous form only
  4. The liquid form only

Questions & Step-by-Step Solutions

What is the standard state of a substance?
  • Step 1: Understand that every substance can exist in different forms, like solid, liquid, or gas.
  • Step 2: Know that the standard state refers to the specific form of a substance that is most stable.
  • Step 3: Remember that this standard state is defined at a pressure of 1 atmosphere (atm).
  • Step 4: Also remember that the temperature for the standard state is 25 degrees Celsius (°C).
  • Step 5: Combine these points to conclude that the standard state is the most stable form of a substance at 1 atm and 25°C.
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