Question

Table A. Enthalpies of Solution Initial Final molar mass moles volume mass of ΔΤ temp temp (C) AHsoln of solute of solute Solute of water (OC) (kJ/mol solute) (°C) (9) (g/mol) solute (mL) 110.98 100. 2.5 - 85 25.2 22.7 0.0123 1.3661 CaCl2 100 74.55 17 -1.8 18.9 20.7 0.0438 3.2689 KCI Table B. Enthalpy of Reaction AHom Final Initial moles volume of volume of final AT moles of (kJ/mol NaOH) temp of temp 0.50 M 0.50 M color (°C) trial H2SO4 (C) (C) NAOH (mL) NaOH H2SO4 (mL) - 75 5.9 22.7 28.6 green 0.033 66.7 0.017 33.3 1 - 74 5.8 29.0 blue 0.033 23.2 66.7 0.017 33.3 2 Average -74.5 AHon

Change these numbers to the correct amount of significant figures based on the information given.

Answer 1

Table A. Enthalpies of Solution volume mass of molar mass Solute of water solute of solute (ML) (9) (g/mol) molesInitial Final of temp temp solute (°C) (°C) 0.0123 22.7 25.2 ΔΤΙ AHsoin (°C) (kJ/mol solute) 1.3661 110.98 2.50 -85 -85.0 1.37 3.27 100. 3.2689 74.55 74.5 0.0438 20.7 18.9 -1.80 17 -17.0 Table B. Enthalpy of Reaction volume of volume of moles trial 0.50 M T moles of 0.50 M L of H2SO4 | H2SO4 (mL) NaOH (mL) NaOH 33.3 0.0170 66.7 0.0330 Initial temp AT Final temp (°C) 28.6 final color (°C) (°C) AHen (kJ/mol NaOH) -75 22.7 green5.90 -75.0 33.3 0.0170 66.7 0.0330 23.2 29.0 blue 5.80 - 74 -74.0 Average A Hon -745 To maintain 3 significant figure we have to change some values as per suggested above

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