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In a Process, 701 J of Heat is Absorbed by a System and 394 J of Work is Done by the System. What is the Change in Internal Energy for the Process? - Chemistry

In a process, 701 J of heat is absorbed by a system and 394 J of work is done by the system. What is the change in internal energy for the process?

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Solution 1

According to the first law of thermodynamics,

ΔU = q + W (i)


ΔU = change in internal energy for a process

q = heat

W = work


q = + 701 J (Since heat is absorbed)

W = –394 J (Since work is done by the system)

Substituting the values in expression (i), we get

ΔU = 701 J + (–394 J)

ΔU = 307 J

Hence, the change in internal energy for the given process is 307 J.

Solution 2

Heat absorbed by the system, q = 701 J Work done by the system = – 394 J Change in internal energy (∆U) = q + w = 701 – 394 = 307 J.

Concept: The Internal Energy as a State Function - Work
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NCERT Class 11 Chemistry Textbook
Chapter 6 Thermodynamics
Q 7 | Page 182
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