A) number of molecules
B) number of moles
C) energy
D) temperature
Correct Answer: C
Solution :
The first law of thermodynamics gives\[Q=\Delta U+W\]which states that if an amount of heat Q is given to a system a part of it will be used in increasing the internal energy\[(\Delta U)\]of the system and the rest in doing work (W) by the system. Thus, the first law of thermodynamics is a form of law of conservation of energy.
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