Energetics: Hess’s Law

Question 1

What is Standard enthalpy change of formation?

Answer 1

The enthalpy change when 1 mole of a compound is formed from its constituent elements with all reactants and products in standard states under standard conditions

Question 2

What is standard enthalpy of reaction?

Answer 2

The enthalpy change measured when substances react under standard conditions in quantities given in the equation

Question 3

What is standard enthalpy of combustion?

Answer 3

The enthalpy change when 1 mole of a substance burns in excess oxygen with all reactants and products in standard states under standard conditions

Question 4

What is enthalpy?

Answer 4

The heat energy change at a constant pressure

Question 5

What are standard conditions?

Answer 5

An enthalpy change measured at 100 kph and 298K. Denoted as delta H

Question 6

What is Hess’s Law?

Answer 6

The total enthalpy change for a reaction is independent of the route taken.