Using activities, calculate the pH of a solution containing 0.010 M NaOH plus 0.0120 M LiNO3. What would be the pH if you neglected activities

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

Iwould appreciate if someone could me.

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: