3.1.4 energetics Flashcards
(5 cards)
1
Q
what’s standard enthalpy of combustion?
A
energy change when 1 mol of a substance is burned completely in oxygen under standard conditions, with each reactant and product in its standard states
2
Q
what’s enthalpy change?
A
heat change of a molecule at constant pressure
3
Q
what’s hess law?
A
enthalpy change of a reaction is independent to the route taken
4
Q
how do you convert from kJ g-1 to kJ mol-1?
A
multiply number by the molar mass of the compound
5
Q
at the end of the experiment if there’s a black deposit of carbon what does that mean?
A
- incomplete combustion occurred
- less energy released
