Heat of Formation

What is the standard heat of formation for water (H2O) in its liquid state?

• -285.8 kJ/mol

• -241.8 kJ/mol

• -298.3 kJ/mol

• -250.5 kJ/mol

Which of the following substances has a standard heat of formation of zero?

• Oxygen gas (O2)

• Carbon dioxide (CO2)

• Methane (CH4)

• Ammonia (NH3)

The heat of formation is defined as the heat change when one mole of a compound is formed from its elements in their _______.

• standard states

• gaseous states

• liquid states

• solid states

Which of the following equations represents the heat of formation for carbon dioxide (CO2)?

Tags

NGSS.HS-PS1-4

What is the significance of a negative heat of formation value?

• The formation of the compound is exothermic

• The formation of the compound is endothermic

• The compound is unstable

• The compound is in a gaseous state

Which of the following has the highest heat of formation?

• Methane (CH4)

• Ethane (C2H6)

• Propane (C3H8)

• Butane (C4H10)

In an experiment, the heat of formation of a compound is measured. Which of the following instruments is most likely used?

• Calorimeter

• Thermometer

• Barometer

• Spectrometer

Tags

NGSS.HS-PS3-4

The heat of formation of a compound is most closely related to which of the following concepts?

• Bond energy

• Molarity

• Pressure

• Volume

Tags

NGSS.HS-PS1-4

Which of the following statements is true about the heat of formation?

• It is always a positive value

• It is always a negative value

• It can be either positive or negative

• It is always zero

How does the heat of formation relate to the stability of a compound?

• Lower heat of formation indicates higher stability

• Higher heat of formation indicates higher stability

• Heat of formation does not relate to stability

• Heat of formation is only related to gaseous compounds