3.1.4 ENERGETICS AUTUFF
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1
What are standard conditions?
100kPa and 298K
2
whats enthalpy change
heat energy change measured under conditions of constant pressure
3
whats standard enthalpy change of combustion
Enthalpy change when ONE mole of substance is burnt completely in oxygen in their standard state and under standard conditions
4
whats standard enthalpy change of formation
Enthalpy change when ONE mole of a compound is formed from its constituent elements under standard conditions with all reactants and products in their standard states.
5
hess law?
total enthalpy change is same to any pathway taken as long starting and final conditions are same
6
which way do arrows face when doing enthalpy change of formation
Up
7
what do you do if you go against arrows?
You reverse the sign for that enthalpy
8
which ways do arrows face when doing enthalpy change of combusting
down
9
bond enthalpy meaning
average amount of energy needed to break one mole of the specific bond in a molecule in gaseous state
10
why is bond enthalpy an average
because in different molecules the bonds enthalpy is different
11
How to calculate standard enthalpy of combustion in experiment
1)use q = mcΔt to find heat energy of WATER
2)Find moles of SUBSTANCE
3) heat energy/moles
2)Find moles of SUBSTANCE
3) heat energy/moles
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