Difference between delta H and q?

  • Thread starter sachin123
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  • #1
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what is the difference between delta H and q?
delta H = delta U + P(delta V)
so,
delta H = delta U -W

delta U=q + W
so,
q=delta U - W

So now is there a difference between the two at all?
Why then 2 separate quantities?
Thank You
 

Answers and Replies

  • #2
Mapes
Science Advisor
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delta H = delta U + P(delta V)

You fixed P to get this expression, so you're no longer looking at the most general case. Does this help answer your question?
 
  • #3
121
0
Yes it does.
So only when the pressure is kept constant,the heat absorbed will become equal to the enthalpy change right?
Thanks Mapes
 

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