thermochemistry

The thermochemical equation for the combustion of methanol is shown below.

CH3OH() + 3/2 O2(g) → CO2(g) + 2 H 2O(g)ΔrH° = –638.7 kJ/mol-rxn

What is the enthalpy change for the combustion of 8.59 g CH3OH?

Iron oxide reacts with aluminum in an exothermic reaction.

Fe2O3(s) + 2 Al(s) → 2 Fe(s) + Al2O3(s)

The reaction of 5.00 g Fe2O3 with excess Al(s) evolves 26.6 kJ of energy in the form of heat. Calculate the enthalpy change per mole of Fe2O3 reacted.

When methane, CH4, and oxygen, O2, are mixed in a stove and ignited, a lovely blue flame results. The balanced equation is: CH₄(g) + 2O₂(g) 2H₂O(g) + CO₂(g) What can be said about the energy involved in this chemical reaction?

I. The average kinetic energy of the products is greater than that of the reactants.

II. The chemical energy stored in the reactants is greater than the chemical energy stored in the products.

III. Chemical energy in the reactants is changed into heat energy and light energy.

The diagram represents two solids and the temperature of each. What occurs when the two solids are placed in contact with each other?

During an exothermic reaction, heat content in the surroundings increases because

The potential energy diagram of a reaction is shown. Which statement below is correct relating to this reaction?