Question 2. (9 points)

Use the following information to answer the following:

a.)

During the formation of phosphorous trichloride, red phosphorous reacts with chlorine gas, accompanied by the following reaction: (Standard enthalpy of formation of PCl₃ = 287.0 kJ/mol.)

2P(s) + 3Cl₂(g) 2PCl₃(g)

Why is the given reaction an exothermic reaction?

a.	Enthalpy of products of a reaction is greater than enthalpy of the reactants.
b.	Enthalpy of the products is less than enthalpy of the reactants.
c.	Enthalpy of the products is equal to the enthalpy of the reactants.
d.	Enthalpy of the products and reactants is zero.
e.	none of the above

b.)

Benzene is an aromatic hydrocarbon. It is a colourless and highly flammable liquid. When two moles of benzene are formed, 99.2 kJ energy is produced.

Which of the following expressions represents the balanced chemical equation?

a.	6CO2 + 3H2(g) C6H6() + 6O2(g) DH = +49.6 kJ
b.	12C(s) + 6H2(g) 2C6H6() DH = 49.6 kJ
c.	6C(s) + 6H2(g) C6H6() DH = 49.6 kJ
d.	12C(s) + 6H2(g) 2C6H6() DH = +99.2 kJ
e.	none of the above

c.)

Which statement does not describe an exothermic reaction?

a.	The temperature of the surroundings increases.
b.	Energy is absorbed by the reaction.
c.	Energy is written as a product in the thermochemical equation.
d.	An example is the combustion of propane.
e.	none of the above