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In an experiment to determine the enthalpy of solution (ΔHsoln) for potassium nitrate (KNO₃), a student dissolves 2.02 g of KNO₃ in 100.00 g of water in a calorimeter. The initial temperature of the water was 22.5°C, and the final temperature after dissolution was 19.4°C. The specific heat of the solution is assumed to be 4.18 J/g°C. The student calculates ΔHsoln using the formula q = m·c·ΔT, then scales it to kJ/mol. Which of the following represents the correct use of significant figures in the final reported value for ΔHsoln?
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