Phthalic acid has two acids (dicarboxylic) and urea two nitrogen, so N, N`.
n/2 = 60Therefore, n = 60 x 2n = 120
80 n and 60 n can refer to Latitude north (abbreviated sometimes as Lat N. or just N) is the angular distance north of the Equator. 80 N means the line eighty degrees north of the Equator. There is...
Nn2 or, if N = n, then n3
'n'