1. What is the amount of energy, in Joules, needed to raise the temperature of 1 mole of water by 15℃? The specific heat capacity of water is 4.18 J g^-1 K^-1.

2. Which of the following equations does NOT represent the enthalpy of combustion of an element?

3. Which of the following statements are correct?

i) The enthalpy of formation of an element is zero by definition
ii) The enthalpy of combustion of an element is zero by definition
iii) The enthalpy change of reaction is the heat change at constant pressure
iv) According to Hess’s Law the enthalpy change for a chemical reaction is the same, whatever route is taken from reactants to products

4. The enthalpy change for the thermal decomposition of CaCO₃ is +177 kJ mol^-1.

What is the enthalpy change in kJ for the thermal decomposition of 15.5.g of CaCO₃?

5. The enthalpy of combustion of ethanol was determined by calorimetry and was found to be -1256 kJ mol^-1

The data book value for the standard enthalpy of combustion of ethanol is -1371 kJ mol^-1.

What is the percentage error of the value determined by calorimetry?

6. Which of the following reactions has a negative enthalpy change?

7. Use the data in the table below to help you answer the following question:

Compound	ΔcHΘ/kJ mol-1
Benzene	-3267
Carbon	-393.5
Hydrogen	-286

What is the enthalpy of formation of Benzene in in kJ mol^-1?

6C(s) + 3H₂(g) → C₆H₆(l)

8. Use the data in the table below to help you answer the question.

Compound	ΔcHΘ/kJ mol-1
Ethanol	-1367
Methane	-890
Ethane	-1560
Methanol	-726

The complete combustion of 0.500 moles of which of the following compounds would result in the greatest increase in the temperature of the surroundings?

9. Use the data in the table below to help you answer the following question:

Compound	ΔfHΘ/kJ mol-1
Propane	104.7
Carbon Dioxide	-393.5
Water	-286

What is standard enthalpy of combustion of propane in kJ mol^-1?

C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(l)

10. The mean bond enthalpies of several bonds are shown in the table below.

Bond	Bond Enthalpy/ kJ mol-1
P-H	322
Cl-Cl	244
H-Cl	428
P-Cl	326

Use this data to answer the following question.

What is the enthalpy change, in kJ mol^-1, for the reaction between Phosphine and Chlorine?

PH₃(g) + 4Cl₂(g) → PCl₅(g) + 3HCl(g)