How much water can be heated to 10 ° C, giving it 168 kJ of heat?
July 24, 2021 | education|
To determine the desired mass of heated water, we use the formula: Q = Cw * m * Δt, whence we express: m = Q / (Cw * Δt).
Values of constants and variables: Q – heat imparted to water (Q = 168 kJ = 168 * 10 ^ 3 J); Sv – specific heat of water (Sv = 4200 J / (kg * K)); Δt is the required temperature change (Δt = 10 ºС).
Let’s calculate: m = Q / (Cw * Δt) = 168 * 10 ^ 3 / (4200 * 10) = 4 kg.
Answer: 4 kg of water will be heated.
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