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Calculate the change in internal energy when a gas is expanded by supplying 1500 J of heat energy.

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Calculate the change in internal energy when a gas is expanded by supplying 1500 J of heat energy. Work done in expansion is 850 J.

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Given : 

Q = 1500 J W = -850 J 

(For expansion work is negative) 

ΔU = ? 

By first law of thermodynamics, 

ΔU = Q + W 

= 1500 + (- 850)

= 650 J

∴ Change in internal energy = Δ U = 650 J

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