What is the hydrogen ion concentration [h+] in a 3.76 x 10^-2 m solution of nitric acid (hno3)

Iam in desperate need of with this !

In vapor-liquid equilibrium in a binary mixture, both components are generally present in both phases. how many degrees of freedom are there for such a system? the reaction between nitrogen and hydrogen to form ammonia occurs in the gas phase. how many degrees of freedom are there for this system? steam and coal react at high temperatures to form hydrogen, carbon monoxide, carbon dioxide, and methane. the following reactions have been suggested as being involved in the chemical transformation:

What is the empirical formula of a compound that is 50.7% antimony and 49.3% selenium ?