Enthalpy Flashcards
1
Q
What is Enthalpy?
A
Heat changes at constant pressure
2
Q
What is the symbol for Enthalpy?
A
‘H’
3
Q
What symbol is used to show an Enthalpy change?
A
🔼H
4
Q
What are standard conditions?
A
100, 000 Pa - standard pressure 298 K (kelvin) - standard temperature
5
Q
What is the standard molar Enthalpy of formation , 🔼Hf
A
The Enthalpy change when 1 mole of a compound is formed from its elements with all substances in standard stated
6
Q
What is Standard molar Enthalpy of combustion, 🔼Hc
A
The Enthalpy change when 1 mole of a compound is completely burnt in oxygen under standard conditions
7
Q
How is Enthalpy change calculated?
A
Enthalpy change (per mole) = q / no.of moles reacting
8
Q
What is the amount of heat give out
A
q = m c 🔼T
q = heat given out (j) m = mass of substance heated (g) 🔼T = temperature rise (K) c = specific heat capacity (j g-1 K-1)
