Method 2 of DeltaU Work done by a gas in a given process is -20J. Heat given to the gas is 60J. Find change in internal energy of the gas.
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change in internal energy of the gas is 80 J
given, work done by a gas in a given process, W = -20 J
Heat given to the gas , ∆Q = 60 J
we have to find change in internal energy of the gas.
from first law of thermodynamics,
∆Q = ∆U + W
⇒60 J = ∆U + (-20 J)
⇒60 J = ∆U - 20J
⇒∆U = 60J + 20J = 80 J
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