Calorimetry and Enthalpy Calculations

This video tutorial explains how to solve a coffee cup calorimeter problem. It covers the setup of the calorimeter, the concepts of exothermic and endothermic reactions, and the calculation of enthalpy change. The tutorial provides a step-by-step guide to determine the enthalpy change in kilojoules per mole for the dissolution of calcium chloride in water, using the specific heat capacity and temperature change.

What is the primary goal of the coffee cup calorimeter problem discussed in the video?

• To measure the density of calcium chloride

• To calculate the enthalpy change in kilojoules per mole

• To find the melting point of calcium chloride

• To determine the boiling point of water

What is the main purpose of using a styrofoam cup in the calorimeter setup?

• To provide structural support

• To measure the volume of water

• To serve as a thermal insulator

• To act as a chemical reactant

If the temperature of the solution increases, what type of reaction is occurring?

• Neutral

• Endothermic

• Exothermic

• No reaction

What does a decrease in the temperature of the solution indicate about the reaction?

• The reaction has stopped

• The reaction is exothermic

• The reaction is endothermic

• The reaction is neutral

Which formula is used to calculate the heat absorbed by the water in the calorimeter?

• q = m * v * ΔT

• q = m * c * ΔT

• q = c * v * ΔT

• q = m * c * v

What is the specific heat capacity of water used in the calculations?

• 5.184 J/g°C

• 4.184 J/g°C

• 3.184 J/g°C

• 2.184 J/g°C

How is the mass of water converted to grams in the calorimeter calculations?

• By using the density of water as 0.5 g/mL

• By using the density of water as 1 g/mL

• By using the density of water as 2 g/mL

• By using the density of water as 1.5 g/mL

What is the molar mass of calcium chloride used in the calculations?

• 100.98 g/mol

• 110.98 g/mol

• 120.98 g/mol

• 130.98 g/mol

How is the enthalpy change per mole calculated?

• By multiplying the heat change by the number of moles

• By dividing the heat change by the number of moles

• By adding the heat change to the number of moles

• By subtracting the heat change from the number of moles

What is the final enthalpy change of the reaction in kilojoules per mole?

• -101.3 kJ/mol

• -91.3 kJ/mol

• -81.3 kJ/mol

• -71.3 kJ/mol