When is delta u equal to delta h in thermodynamics?
Answers
Answered by
16
menu
X
Sign in or Register for a free account
Download the Free App

K-12 Wiki
News
Knowledge World
Exam Corner
Q & A Forum
Experts Panel
Ask
+
Academic Questions and Answers Forum, 91000+ Questions asked
View all questions
Syeda answered 10 month(s) ago
RELATIONSHIP BETWEEN ∆H &∆U
DERIVE A RELATIONSHIP BETWEEN DELTA H AND DELTA U...?
Class-XI Chemistry
person
Asked by Sagar
Oct 5
4 Likes
21974 views
editAnswer
Like
Follow
2 Answers
Top Recommend
|
Recent
person
Swathi , SubjectMatterExpert
Member since Apr 28 2014
Relation between ∆H &∆U:
Solids and liquids do not show significant change in the volume when heated. Thus if change in volume, ∆V is insignificant
∆H=∆U+P∆V
∆H=∆U+P(0)
∆H=∆U
The difference between the change in internal energy and enthalpy becomes significant when gases are involved in the reaction.
Consider a chemical reaction occurring at constant temperature, T and constant pressure, P. Now, let’s say that the volume of the reactants is VA and the number of moles in the reactants is nA. Similarly, the volume of the products is VB and the number of moles in the product is nB.
We know that according to the ideal gas equation,
Pv=nRT
pvA=nART
pvB= nBRT
Thus
pvB- pvA = nBRT- nART
p(vB- vA) =RT(nB-nA)
p∆v =∆ngRT
∆H=∆U +p∆v
∆H=∆U+∆ngRT
X
Sign in or Register for a free account
Download the Free App

K-12 Wiki
News
Knowledge World
Exam Corner
Q & A Forum
Experts Panel
Ask
+
Academic Questions and Answers Forum, 91000+ Questions asked
View all questions
Syeda answered 10 month(s) ago
RELATIONSHIP BETWEEN ∆H &∆U
DERIVE A RELATIONSHIP BETWEEN DELTA H AND DELTA U...?
Class-XI Chemistry
person
Asked by Sagar
Oct 5
4 Likes
21974 views
editAnswer
Like
Follow
2 Answers
Top Recommend
|
Recent
person
Swathi , SubjectMatterExpert
Member since Apr 28 2014
Relation between ∆H &∆U:
Solids and liquids do not show significant change in the volume when heated. Thus if change in volume, ∆V is insignificant
∆H=∆U+P∆V
∆H=∆U+P(0)
∆H=∆U
The difference between the change in internal energy and enthalpy becomes significant when gases are involved in the reaction.
Consider a chemical reaction occurring at constant temperature, T and constant pressure, P. Now, let’s say that the volume of the reactants is VA and the number of moles in the reactants is nA. Similarly, the volume of the products is VB and the number of moles in the product is nB.
We know that according to the ideal gas equation,
Pv=nRT
pvA=nART
pvB= nBRT
Thus
pvB- pvA = nBRT- nART
p(vB- vA) =RT(nB-nA)
p∆v =∆ngRT
∆H=∆U +p∆v
∆H=∆U+∆ngRT
Similar questions