Question

Question 4

The aluminum cup inside your calorimeter weighs 41.55 g. You add 59.21 g of 1.0 M acetic acid solution and 50.03 g of 1.0 M sodium hydroxide solution to the calorimeter. Both solutions have an initial temperature of 19.9 ^oC, and the final temperature after addition is 26.8 ^oC. What is the molar enthalpy of neutralization, in units of kJ/mol?

Assume that:

• the calorimeter is completely insulated
• the heat capacity of the empty calorimeter is the heat capacity of the aluminum cup: 0.903 J g^-1oC^-1.
• the density of the two solutions is the same as that of water: 1.00 g/mL.
• the heat capacity of the two solutions is the same as that of water: 4.184 J g^-1oC^-1.

Perform all calculations without rounding, but then provide your answer to the correct number of significant figures.

Question 5

The aluminum cup inside your calorimeter weighs 39.78 g. You add 50.01 g of ice cold water to the calorimeter. You measure the temperature of the calorimeter to be 0.5^oC just before your next addition. You then add 50.72 g of hot water and a 49.98 g metal object, all having an initial temperature of 69.5^oC. After the calorimeter reaches thermal equilibrium, the final temperature is measured to be 35.9^oC.

What is the specific heat of the metal object, in units of J g^-1oC^-1.

Assume that:

• the calorimeter is completely insulated
• the heat capacity of the empty calorimeter is the heat capacity of the aluminum cup: 0.903 J g^-1oC^-1.
• the density of water is: 1.00 g/mL.
• the heat capacity of water is: 4.184 J g^-1oC^-1.

Perform all calculations without rounding, but then provide your answer to the correct number of significant figures. Units can be entered as J/(gK).

Answer 1