Question

In gas chromatography, (a) why do open tubular columns yield greater solute resolution than packed columns? (Check all that apply.)

A.Open tubular columns have greater sample capacity.

B.Open tubular columns eliminate the multiple path term (A) from the van Deemter equation.

C.Open tubular columns have a lower resistance to gas flow, so longer columns can be used without increasing solute retention times.

-why can more rapid flow rates be used with H2 and He carrier gases than with N2, without sacrificing column efficiency?

A.H2 and He have larger mass transfer terms (Cux) in the van Deemter equation than does N2.

B.Solutes equilibrate between mobile and stationary phases more rapidly in N2 than in H2 and He.

C.Solutes diffuse more rapidly through H2 and He than through N2.

Thanks so much!!!

Answer 1