When a 130 G Sample of NaOH(s) Dissolves in 400

question 14

Multiple Choice

When a 13.0 g sample of NaOH(s) dissolves in 400.0 mL of water to produce 413.0 g of solution in a constant pressure calorimeter, the temperature of the water and reaction vessel changes from 22.6°C to 30.6°C. Assume that the specific heat capacity of the solution is 4.20 J/(g . °C) , and that the heat capacity of the reaction vessel is 1.00 J/°C. What is the molar enthalpy of solution of sodium hydroxide (40.00 g/mol) ?

• A) 34 kJ/mol
• B) 54 kJ/mol
• C) 17 kJ/mol
• D) 43 kJ/mol
• E) 14 kJ/mol

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