how much heat in kcal must be added to 0.5kg of water at room temperature (20°C) to raise its temperature to 50°C?

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We know that the energy required to raise the temperature of a substance is the product of that substance's mass, specific heat capacity and the change in temperature. Mathematically: Q = m * Cp * delta(T) The Cp of water in Kcal/(kg*K) or Kcal/(kg*C) is 1. (Per unit Celsius and per unit Kelvin are interchangeable because one degree change in Celsius is equal to one degree change in Kelvin) Using the formula, Q = 0.5 * 1 * (50-20) Q = 15 Kcal

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