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A system absorbs 191 kj of heat and the surroundings do 120 kj of work on the system. what is the change in internal energy of the system?

Respuesta :

The change in internal energy of the system is that there is an increase of 306kj in internal energy.
By using the first law and sign convention;
ΔE₍int₎ = Q - W
But Q₍int₎  greater than 0
W₍int₎ less than 0
in convention
So, 
ΔE₍int₎ = Q - W
 = 186 - (-120)
= 186 + 120
=306 kj

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