Brain Teaser #68

[Greg Bernhardt]

At standard temperature and pressure, what is the heat of formation of water vapor?

[NateTG]

Heat of formation for
H2O from H2 and O2 is -68.32 Kcal/Mol

The latent heat of evaporation is -600 ca/g

[meteor]

Heat of formation for a mole of water vapor: -241.82 kJ

[chroot]

How is this a brain teaser? And the phrase "at standard temperature" seems very odd to me in this circumstance, but it's been a while since I've considered this sort of stuff.

- Warren

[Bailey]

too late, but i would say its -241.8 KJ/mol of H2O(g) produced , which is the same as meteor's answer.

[Greg Bernhardt]

NateTG with the point!