Practice Standard Enthalpy Of Combustion (5.5.a) - Thermodynamics

Practise this section

8 questions

Flashcard drill
2 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
Sign up to start the exercise
Quiz
2 questions · about 1 min · pass mark 70%. Hints available.
Sign up to start the quiz

6 sample questions

Question 1.
Define Standard Enthalpy of Combustion.
Show hintHide hint
Think about the energy released when fuels burn.
Question 2.
What are the typical products of combustion reactions?
Show hintHide hint
Consider complete combustion in oxygen.
3Question 3.
What does Standard Enthalpy of Combustion measure?
- A. Heat absorbed
- B. Heat released during combustion
- C. Total energy of a system
Show hintHide hint
Focus on energy flow during combustion.
4Question 4.
Combustion reactions are usually:
- True
- False
Show hintHide hint
Consider energy changes in combustion processes.
Question 5.
Calculate the enthalpy of combustion for propane (C₃H₈) given the reaction: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O. Use known enthalpies to find the result.
Show hintHide hint
Set up the Hess's law equation, balance everything, and remember to input values correctly.
Question 6.
A fuel cell's combustion efficiency can be calculated using its standard enthalpy. If a given fuel has a ∆cH° of -2800 kJ/mol and burns 100 moles, what is the total energy released?
Show hintHide hint
Watch out for unit conversions!

4 more questions in this section. Enroll free to practise them all.