The water molecules gets trapped in the crystal structure to be analysed and will give a peak in the spectra at about 3500 /cm , and there by hindering with the IR spectra of the sample to be analysed .
The second problem with the contamination of the sample with water is , that water makes the potassium bromide disc opaque which will decrease the absorption of the IR by the sample .
N2 stands for nitrogen. this compound also includes the exact mass. If you have any other questions please contact me here on Brainly.com and i will be happy to help. please note- I didn't quite understand the question fully. -Diane
