enthalpy changes

amo1

14

whats the difference between standard enthalpy change of combustion, formation, atomisation... thanks

Reply 1

oxymoron

7

combustion:

enthalpy change when one mole of substance is burned completely in excess oxygen

Formation:

enthalpy change when one mole of substance is formed from elements in their standard states

Atomisation:

enthalpy change when one mole of substance converted into gasseous atoms

ALL: under standard conditions

Reply 2

amo1

OP

14

oxymoron

combustion:

enthalpy change when one mole of substance is burned completely in excess oxygen

Formation:

enthalpy change when one mole of substance is formed from elements in their standard states

Atomisation:

enthalpy change when one mole of substance converted into gasseous atoms

ALL: under standard conditions

for the hess diagrams the bit at the bottom, which ones use 2H(g), and which use H2(g)

Reply 3

oxymoron

7

formation uses H2 (g) .... ie in standard state

atomisation produces 2H (g) .... ie gasseous atoms

enthalpy changes

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