# Where can I find the total enthalpy and heat of dissolution in water of a given components?

I don't really have a background in chemistry but I'm actually studying in aerospace engineering, sorry if this question may seem trivial.

I am interested in the decomposition process of the hydrogen peroxide ($\ce{H2O2}$) and I need to find the total enthalpies of $\ce{H2O2}$, $\ce{H2O (l)}$, $\ce{H2O (g)}$ and $\ce{O2 (g)}$ and the heat of dissolution ($\Delta H_{\text{dis}}$)of $\ce{H2O2}$ in water, as a function of the solution concentration of $\ce{H2O2}$.

Firstly, I tried to find the values of the total enthalpies, but I couldn't find them. However, I found a lot of values about the $\Delta H^0$ and $h^o_f$. I can't understand if I can retrieve the value of $H$ with the $\Delta H^0$ and/or $h^o_f$.

Secondly, I can't find a good answer to another question. Does the $H$ is a function of the pressure or not? If so, how can I find the value of $H$ at a given pressure and a given temperature?