When heating water by 10 degrees, 8400 KJ of energy was spent. find the mass of hot water.

These tasks: Δt (change in temperature of the taken water during heating) = 10 ºС; Q (consumed amount of thermal energy) = 8400 J.

Reference values: Cw (specific heat of water) = 4200 J / (kg * K).

The mass of heated water can be expressed from the formula: Q = Cw * m * Δt, whence m = Q / (Cw * Δt).

Let’s calculate: m = 8400 / (4200 * 10) = 0.2 kg or 200 g.

Answer: The mass of heated water is 200 grams.

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