L6th Energetics

Enthalpy change is the heat energy transferred at constant ________

The enthalpy change for an exothermic reaction is ________

• Enthalpy change of the reaction

• Activation energy of the reaction

• Activation energy of the reverse reaction

• The enthalpy of the transition state

• The arrow for the enthalpy change should point upwards only

• The products and reagents are the wrong way around

• The arrowhead for the activation energy should be pointing upwards only.

What is the pressure for standard conditions in kPa?

What temperature is standard conditions, in K?

What enthalpy change is represented by this reaction?

2CH₄(g) + 3O₂(g) --> 2H₂O(l) + 2CO₂(g)

• Enthalpy of formation of water

• Enthalpy of combustion of methane

• Enthalpy of combustion of methane x 2

• Enthalpy of oxidation of methane

• Elements in their standard states

• Reaction takes place at 101 kPa and 273 K

• Reaction takes place at room temperature and pressure

• Reaction takes place at 101 kPa and 298 K

Enthapy of neutralisation is defined per mole of...

A student starts with a spirit burner containing methanol that has mass 84.7 g. He uses it to heat 125 g of water from 22 ^OC to 58 ^OC. After this, the mass of the spirit burner and methanol is 83.2 g.

Using these data, find the enthalpy of combustion for methanol (the specific heat capacity of water is 4.18 J/g/^OC)

Give your answer to two significant figures, in kJ/mol