8. Thermochemistry

Two compounds were dissolved in water and mixed together. A precipitate formed, and the test tube got very warm. Based on this information, which of these statements is true?

547 J of thermal energy is added to a 200.0 g sample of iron that is initially at 68.0 °C. If the specific heat capacity of iron is 0.449 J/g°C, what will be the final temperature in °C?

A 1.720 g sample of naphthalene (C10H8) undergoes combustion in a bomb calorimeter, causing the temperature to rise from 24.00°C to 47.57°C. If the heat capacity of the calorimeter is 2940 J/°C, what is the enthalpy of combustion of naphthalene in kJ/mol?

A 100.0 mL sample of 0.300 M NaOH is mixed with a 100.0 mL sample of 0.300 M HNO3 in a coffee cup calorimeter. If both solutions were initially at 35.00°C and the temperature of the resulting solution was recorded as 37.00°C, determine the ΔH°rxn (in kJ/mol) for the neutralization reaction.

A 25.0 g piece of aluminum (which has a molar heat capacity of 24.03 J/mol °C) is heated to 85.1 °C and dropped into a calorimeter containing water (specific heat capacity of water is 4.18 J/g °C) initially at 25.0 °C. Assuming no heat is lost to the surroundings, what is the final temperature of the system?

After adding the NaOH to the H2SO4 solution, the temperature of the mixture increases to 32.5°C. What type of reaction is occurring in the coffee cup?

When 100.0 mL of 0.200 M CsOH is mixed with 50.0 mL of 0.400 M HCl in a calorimeter, the temperature increases from 22.50 °C to 24.28 °C. What type of reaction is occurring?

When 100.0 mL of 0.200 M KOH is mixed with 50.0 mL of 0.400 M HNO3 in a calorimeter, the temperature increases from 22.50 °C to 24.32 °C. What type of reaction is occurring?

When 100.0 mL of 0.200 M NaOH is mixed with 50.0 mL of 0.400 M HCl in a calorimeter, the temperature increases from 22.50 °C to 24.31 °C. Based on this temperature change, what type of reaction is occurring?

When 100.0 mL of 0.200 M NaOH is mixed with 50.0 mL of 0.400 M HF in a calorimeter, the temperature increases from 22.50 °C to 24.68 °C. Based on this temperature change, what type of reaction is occurring?

At 25°C, the heat of fusion of aluminum is 10.6 kJ/mol and the heat of sublimation is 326.4 kJ/mol. What is the heat of vaporization of aluminum at 25°C?

Barium dioxide decomposes into barium oxide and oxygen gas according to the following reaction: 2 BaO2 → 2 BaO + O2. If 27.3 grams of BaO2 decompose and 168 kJ of heat is absorbed in this process, what is the enthalpy change (ΔH) of this reaction in kJ/mol rxn?