Standard Enthalpy of Formation
Chemistry ⇒ Thermochemistry and Energetics
Standard Enthalpy of Formation starts at 11 and continues till grade 12.
QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Standard Enthalpy of Formation.
How you perform is determined by your score and the time you take.
When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 11
Describe how standard enthalpy of formation values are used to calculate the enthalpy change of a chemical reaction.
Describe the difference between standard enthalpy of formation and standard enthalpy of combustion.
Describe the importance of standard enthalpy of formation values in calculating enthalpy changes for chemical reactions.
Explain why the standard enthalpy of formation of Cl2(g) is zero.
Calculate the standard enthalpy change for the reaction: 2 CO(g) + O2(g) → 2 CO2(g), given ΔH−f° [CO(g)] = -110 kJ/mol and ΔH−f° [CO2(g)] = -394 kJ/mol.
Given the following data: ΔH−f° [C2H5OH(l)] = -277 kJ/mol, ΔH−f° [CO2(g)] = -394 kJ/mol, ΔH−f° [H2O(l)] = -286 kJ/mol. Calculate the enthalpy change for the reaction: C2H5OH(l) + 3 O2(g) → 2 CO2(g) + 3 H2O(l).
Given the following data: ΔH−f° [C6H12O6(s)] = -1273 kJ/mol, ΔH−f° [CO2(g)] = -394 kJ/mol, ΔH−f° [H2O(l)] = -286 kJ/mol. Calculate the enthalpy change for the reaction: C6H12O6(s) + 6 O2(g) → 6 CO2(g) + 6 H2O(l).
Given the following data: ΔH−f° [CH4(g)] = -75 kJ/mol, ΔH−f° [CO2(g)] = -394 kJ/mol, ΔH−f° [H2O(l)] = -286 kJ/mol. Calculate the enthalpy change for the reaction: CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l).
Which of the following best defines the standard enthalpy of formation? (1) The enthalpy change when 1 mole of a compound is formed from its elements in their standard states under standard conditions. (2) The enthalpy change when 1 mole of a compound is decomposed into its elements. (3) The enthalpy change when 1 mole of a compound reacts with oxygen. (4) The enthalpy change when 1 mole of a compound is dissolved in water.
Which of the following compounds has a standard enthalpy of formation of zero? (1) O2(g) (2) CO2(g) (3) H2O(l) (4) CH4(g)
Which of the following is NOT a standard state? (1) H2O(l) at 25°C and 1 atm (2) O2(g) at 25°C and 1 atm (3) Na(s) at 25°C and 1 atm (4) CO2(g) at 100°C and 1 atm
Which of the following is the correct formation equation for Na2O(s)? (1) 2 Na(s) + 1/2 O2(g) → Na2O(s) (2) Na(s) + O2(g) → Na2O(s) (3) 2 Na(s) + O2(g) → Na2O(s) (4) Na2O(s) → 2 Na(s) + 1/2 O2(g)
Fill in the blank: The standard enthalpy of formation of a compound is always measured at a pressure of ________ atm.
Fill in the blank: The standard enthalpy of formation of a compound is based on the formation from its ________ in their standard states.
Fill in the blank: The standard enthalpy of formation of a compound is measured per ________ of the compound formed.
Fill in the blank: The standard enthalpy of formation of a compound is the enthalpy change when 1 mole of the compound is formed from its elements in their ________ states under standard conditions.
True or False: The standard enthalpy of formation can be positive or negative.
True or False: The standard enthalpy of formation for H2O(l) is always positive.
True or False: The standard enthalpy of formation of a compound can be determined experimentally.
True or False: The standard enthalpy of formation of a compound is always measured at 298 K.
