Question

What would happen to the moles of H2(g) you collect if the ZnO layer was present? How about the value of R that you would calculate?
From Gas Boyles Law and Experimental Determination of the Ideal Gas constant

Answer 1

If there are more than 2 gases (H2 and now ZnO) we can talk now of a composition of a total mixture.From the Boyle`s Law, we can determinated the composition of each component as below form:

, so:

where :

the sumatory of each side :

Sorting the terms and common factors :

As we know the sumatory of Pi = Pmix,thus:

and

the volumetric composition will be calculated:

To other side, R that we would calculate will the R to the mixture :

For the mixture the R constant will be determinated from the equation of ideal gas combinated ( combination of Boyle , charles and avogadro laws ) and that typically describes the relationship between pressure , volume , temperature and the amount ( mole ) of an ideal gas :