Math  /  Data & Statistics

QuestionPreliminary Problems
1. Answer the following question for the following reaction in aqueous solution: Na2 S2O3+4NaClO+2NaOH2Na2SO4+4NaCl+H2O\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}+4 \mathrm{NaClO}+2 \mathrm{NaOH} \rightarrow 2 \mathrm{Na}_{2} \mathrm{SO}_{4}+4 \mathrm{NaCl}+\mathrm{H}_{2} \mathrm{O}

The reaction was carried out using 80.0 mL of 1.200 M NaClO , with excess sodium hydroxide, and 50.0 mL of 0.400MNa2 S2O30.400 \mathrm{M} \mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}, mixed in a calorimeter. The solutions and calorimeter were initially all at the same temperature. As a result of the reaction, the temperature rose 30.00C30.00^{\circ} \mathrm{C}. The heat capacity of the calorimeter is 254 J/C254 \mathrm{~J} /{ }^{\circ} \mathrm{C}. What is the ΔH\Delta H for the reaction? Assume that the heat capacity of the solutions is 4.18 J(C)14.18 \mathrm{~J}\left({ }^{\circ} \mathrm{C}\right)^{-1} per mL (the same as for water at 25C25^{\circ} \mathrm{C} ) and that there is no change in total volume during the reaction. The reaction is rapid. Assume that it is the only reaction, and that it goes to completion.

Studdy Solution
The enthalpy change (ΔH\Delta H) for the reaction is 1197-1197 kJ/mol.

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