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“Total energy of system entering plus addition during process must equal to total energy of the system leaving” is which law of thermodynamics?

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“Total energy of system entering plus addition during process must equal to total energy of the system leaving” is which law of thermodynamics?

(a) First law

(b) Second law

(c) Third law

(d) None of the mentioned

I got this question in my homework.

The origin of the question is Inorganic Chemical topic in portion Inorganic Chemical Industries of Chemical Technology

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The correct answer is (a) First law

The best explanation: First law of thermodynamics is a version of Law of conservation of energy, which states that Total energy given to the system is used to increase the internal energy of the system and the expansion (PV) work.

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