Problem 1
Define Hess's law.
Problem 1
What is the work when \(124 \mathrm{~mL}\) of gas contract to \(72.0 \mathrm{~mL}\) under an external pressure of 822 torr?
Problem 1
Give two definitions of work.
Problem 1
Under what circumstances are \(q\) and \(\Delta H\) the same?
Problem 1
Define formation reaction and give an example.
Problem 1
Define energy. How is work related to energy?
Problem 2
What does Hess's law require us to do to the \(\Delta H\) of a thermochemical equation if we reverse the equation?
Problem 2
What is the sign on work when a sample of gas increases its volume? Explain why work has that sign.
Problem 2
Write the equivalences that this balanced thermochemical equation implies. \(2 \mathrm{SO}_{3}(\mathrm{~g}) \rightarrow 2 \mathrm{SO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \Delta H=197.9 \mathrm{~kJ}\)
Problem 2
Explain the importance of formation reactions in thermochemical equations.
