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A steam engine receives 300 kJ of heat from its environment and does 400 kJ of work. How much does the energy of the steam engine change?

1 Answer

Nov 23, 2017

Energy of system is decreased by #"100 kilojoules"#

Explanation:

Form 1st law of thermodynamics

#"dU = dQ + dW"#

#"dU = 300 kJ + (-400 kJ)"#

[Work is done by the steam engine. Hence i took -400 kJ]

#"dU = -100 kJ"#

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