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The specific heat capacity of water is 4.18 J/g°C. To find the mass of water that changes by 15°C when absorbing 2646 J of energy, you can use the formula: q = mcΔT (where q is the heat energy absorbed, m is the mass, c is the specific heat capacity, and ΔT is the temperature change). Rearranging the formula, you get m = q / (c * ΔT) = 2646 / (4.18 * 15) ≈ 42 grams of water.

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