1a) Calculate the enthalpy change when 1.0g of hydrogen burns in oxygen.
I got -286kJmol^-1, the same as the standard enthalpy change of formation of water. Is this right? Because it's the same reaction right?
b) What is the standard enthalpy change for the following reaction?
h2O (l) -----> H2(g) + 1/2O2(g)
I put 286kJmol-1 for this one, as is it not the reverse of the formation of water, and so it follows that the enthalpy change will have the reverse sign?
Anyone that could tell me if i'm right or not on these questions would be a great help!