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

question 50

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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Definitions:

Negative Reinforcement

A behavioral technique in which the removal of an unpleasant stimulus strengthens a behavior or makes it more likely to occur.

Extra Credit

Additional points awarded to students beyond the regular assignments and exams, often to enhance their final grade.

Make-up Exam

A test offered at a later time for students who were unable to attend the original exam due to valid reasons.

Schedule of Reinforcement

The specific pattern and timing of presenting rewards in operant conditioning to shape behavior.