The work done by a system is 10 Joule, when 40 Joule heat is supplied to it. What is the increase in internal energy of system?
Correct answer: A. 30J
- A. 30J
- B. 40 J
- C. 50 J
- D. 20 J
Explanation
To find the increase in internal energy of the system, we can use the first law of thermodynamics, which states: ΔU = Q - W where: ΔU = change in internal energy of the system Q = heat supplied to the system W = work done by the system Given: Q = 40 Joule (heat supplied to the system) W = 10 Joule (work done by the system) Now, put the values into the equation: ΔU = 40 J - 10 J ΔU =30 J The increase in the internal energy of the system is 30 Joules, therefore option A is the correct answer.
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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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