(a) Typical GC-MS columns are 25-50 meters long. What aspect of the column allows it tobe so long while still achieving good resolution? (b) What is the most important experimental parameter that changes peak resolution and retention time in GC? (c) Identify the carrier gas used in our GC-MS experiment. Explain why this gas is often used as a carrier gas. (d) Identify a carrier gas that would NOT be used for GC. Explain why it would not used as a carrier gas. (e) Calculate the number of theoretical plates (N) from the gas chromatogram below.