Heat required to raise 2 kg water from 20°C to 100°C: (c_water = 4200 J/kg·K)

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Q = mcΔT = 2×4200×(100-20) = 2×4200×80 = 672000 J = 672 kJ. Direct calorimetry formula application. Memory tip: 'Q = mcΔT; ΔT in Celsius or Kelvin same'. Basic numerical testing specific heat concept, frequently appearing in thermodynamics sections of competitive exams.

Heat required to raise 2 kg water from 20°C to 100°C: (c_water = 4200 J/kg·K) MCQ with Answer and Explanation

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