3. The average molar heat capacity of solid caustic soda in the temperature range of 298-595 K is 80.32 J / mol * deg and liquid sodium in the range of 595-900 K - 85.35 J / mol * deg. Determine the amount of heat absorbed during isobaric heating of 1 kg of sodium hydroxide from 298 to 700 K, if the heat of fusion is 8363 J/mol and the melting point is 595 K.

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