If work done on a system is 650) and heat taken out from the system is 500J, the change in internal?
Correct answer: C. +150
- A. -1150
- B. +1150
- C. +150
- D. -150
Explanation
The change in internal energy is given by the equation:∆E = q - w,where q is the heat transferred to the system and w is the work done by the system.In this case, the heat transferred to the system is -500 J (heat is taken out of the system, so it has a negative sign) and the work done by the system is 650 J. Therefore, the change in internal energy is: ∆E = -500 J + 650 J = 150 J .
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About Thermochemistry and Energetics of Chemical Reactions
Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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