You are provided with (i) theoretic bond refractive index (Table 1), (ii) density, p (1.046 gcm-3) and molecular weight, ( M=60) of acetic acid(ethanoic acid) and (iii) equation (1), Estimate the refractivve index, n of acetic acid.
Table 1
Bond refractive index
C-H 1.65
C-C 1.20
C=O 3.34
C-O 1.41
O-H 1.85
Mr = ( M /p) x (n^2 -1) / (n^2 + 2)..(1)
I have found the theoretic bond refractive index of acetic acid
= 3 x 1.65 + 1.20 + 3.34 + 1.41 + 1.85 = 12.75
But what is the use of the two datas and equation(1)? Also, I don't know what Mr is.
So I cannot know how to estimate refractive index of acetic acid. Please *delete me*