What is the heat of formation of water vapor?

1 Answer
Truong-Son N.
Aug 21, 2016

If you look in the back of your textbook (the appendices), you should find that it is #DeltaH_f^@ = -"241.8 kJ/mol"#. Make sure you look for #"H"_2"O"(g)# under oxygen-based substances, not #"H"_2"O"(l)#.

The formation reaction is just:

#"H"_2(g) + 1/2"O"_2(g) -> "H"_2"O"(g)#

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