What is the standard enthalpy change for the formation of an element in its stan
Practice Questions
Q1
What is the standard enthalpy change for the formation of an element in its standard state?
Zero
Positive
Negative
Depends on the element
Questions & Step-by-Step Solutions
What is the standard enthalpy change for the formation of an element in its standard state?
Correct Answer: 0
Step 1: Understand what 'enthalpy change' means. It refers to the heat content change during a chemical reaction.
Step 2: Know what 'formation' means. It is the process of creating a compound from its elements.
Step 3: Learn about 'standard state.' This is the most stable form of an element at 1 atmosphere of pressure and a specified temperature (usually 25 degrees Celsius).
Step 4: Recognize that when we talk about the formation of an element in its standard state, we are not changing it; it is already in its most stable form.
Step 5: Conclude that since there is no change in heat content when forming an element from itself, the standard enthalpy change is defined as zero.
