Is it possible to prove that something is real or true of you can’t directly observe it? If no, why not? If yes, how would you do that?

The reaction q+r2=r2q is found to be first order in r2 and

What is the number of moles in 15.0 g ash3?

What stress will shift the following equilibrium system to the left? n2(g) + 3h2(g) ⇌ 2nh3(g) adding more n2(g) adding more nh3(g) increasing the pressure of the system reducing the volume of the container