If a 15-cm-long column has a plate height of 5.0 m, what will be the half-width (in seconds) of a peak eluted at 10.0 min? If plate height 25 m, what will be w1/2?
Writinga Formulafroma Name: Forbinary nonmetalcompounds: Thenumerical prefixes will tell you howmanyof each element is present. Ifthere is noprefix, assumethat there is oneof that element. Forionic compounds: You mustknowthecharges on all oftheions. Write downtheions with their charges, anddetermine thesmallest numberofeach ion that is needed so that thetotalnumberofpositivecharges is equal to thetotalnumberofnegative charges. Foracids: Figureout thecharge on theanion. Write downthenumberofH+ ions that are needed to balance thenumberofnegative charges on the anion. Mass Percent: Knowingthemass percent of an element in acompoundis usefulfordetermining theformulaofthe compound. Themass percent ofan element can be calculated fromtheformula, as follows: 1) Find thet