What is the "delta"H for water?

Question

What is the "delta"H for

2 H2+ 02 -> 2 H2O

Thanks

Answer 1

-285.83 kJ mol-1 (liquid)

The equation as you have written it is for two moles so it will be twice that value.

Answer 2

That would depend on the phase of the water:

Gas: -241.83 kJ/mol

Liquid: -285.83 kJ/mol