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First Law of Thermodynamics

In a process ...

Question

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

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Solution

According to 1st law of thermodynamic
$△ U = q + w$
Heat absorbed by system $\Rightarrow q = + 701 J o u l e$
$w =$ Work done by system
$w = - 394 J$
$△ U = + 701 - 394$
$△ U = 307 J o u l e$

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