What is the heat required to raise the temperature of 200 g of water from 20.0°C to 50.0°C? (Specific heat of water = 4.18 J/g· °C)
Correct answer: C. 25080 J
- A. 4180 J
- B. 8360 J
- C. 25080 J
- D. 50160 J
Explanation
Heat q = m × c × ΔT = 200 × 4.18 × (50.0 - 20.0) = 25080 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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