The amount of heat required to heat water can be calculated using the formula:
Q = C * m * ∆t, where Q is the amount of heat expended on heating (Q = 4.5 kJ = 4500 J), C is the specific heat capacity of water (C = 4200 J / (kg * K)), m is the required mass of water (kg), ∆t – change in water temperature (∆t = 40 ºС).
Let us express and calculate the mass of heated water:
m = Q / (C * ∆t) = 4500 / (4200 * 40) = 0.0268 kg = 26.8 g.
Answer: You can heat 26.8 g of water.
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